Let us see how the Al-Saudi clan and the ruling dynasty came into being? Allow me to publish here the article of www. origo.hu (http://orientalista.hu/szaud-arabia-igaztortenete-zsidok-alapitottak-a-vahabita-kiralysagot/).

The basic research in this subject was made by Mohamed Shaker who was going to get answer for the following questions:

Are the members of Al-Saud family originated from the tribe of Anza bin Wa’el? Is the Islam their original faith? Are they Arab at all?
The research of Mr. Shaker unveiled the regime of Al-Saud and he came to the same conclusions as the military intelligence of Iraq.
In the year of 851 according to Hijra (which coincides with 1447 according to Gregorian) the caravan of Masaleekh men which belonged to the Anza tribe transported grains, maize, wheat and other foodstuff from Iraq to Najd.
The leader of their clan was Sahmi Bin Hathool. When the clan reached to Basra (Iraq) they looked for a Jewish merchant called Mordekhai bin Ibrahim bin Moshe. When they made the deal with him the merchant asked them: “From which tribe you are from?” They said: “We are from the AlMasaleekh clan of Anza tribe”. When the Jewish merchant heard the name, he felt happy and he welcomed them warmly. He said he is from Anza tribe too but he has to live in Basra (Iraq) due to the conflict which was raised between his father and some Anza people.
After performing this false story about his origin, the Jew ordered his servants to fill up the bags of the clan with dates, wheat and fruits.
The generous deed of the Jew surprised the members of Al-Masaleekh and they felt proud to find their beloved relative in Iraq who ensured for them food. They believed what the Jew told them. He was a rich merchant and they were in need to foodstuff. So, they accepted him as their own member.
When the caravan was ready to leave the Jewish merchant asked them to take him with them in order to get back to his beloved homeland in Najd. The members of the clan welcomed his will and were happy to take him.
So, the (secret) Jew could travel with the caravan to Najd. When he reached there, he started his propaganda to spread. He told everywhere that he is one of their close relatives so he could collect a lot of followers around him. When he had a big number of sympathizers, he suddenly started a campaign against Sheikh Saleh Salman Abdallah Al-Tamini who was a Muslim preacher at AlQasseem.
Sheikh Saleh Salman Abdallah Al-Tamini was an emblematic preacher so he had followers beyond Najd even in Yemen and Hijaz. The attempt of the Jew failed and he had to leave Al-Qasseem. He moved to Al-Isha and changed his name from Modekhai to Markhan bin Ibrahim bin Musa. Later he went further to Al-Quteef which is near to the town called Al-Diriya.
In his new place he started to propagate a false story about the shield of Prophet Mohammad (PBUH). In this story the shield was taken by pagan Arabs as prey from the Muslims and a war started between pagans and believers. The pagans at the end sold the shield to a Jewish tribe called Bani Qunaiqa and they still keep that treasure with them.
His stories strengthened his position between the Bedouins so he decided to settle permanently in Al-Quteef. He felt that people of that place trust him so he wanted to develop it as his headquarter in the Persian Gulf. He thought Al-Quteef as a spring board which helps him to establish a Jewish kingdom in the Persian Gulf.
In order to realize his ambitious plan, he approached to the Bedouins for getting their support. Day by day he titled himself as “king” among them. However, the Bedouins investigated who is him and the tribes of Ajaman and Banu Khaled found out his real background. They also unveiled his plan so they decided to kill him. They occupied the place where he lived but somehow, he could escape with the help of his followers.
The Jewish ascendant of the Saudi family took refuge in a farm at Al-Arid near to Al-Malibeed Ghusai. The name of this place today is Riyadh. He asked the owner of the farm to give him shelter. The owner was a kind man and he immediately helped him.
After he spent one month with his generous landlord, he killed him and all members of his family than he said that this act was made by a group of thieves. He also told that he had bought the farm from his owner just before the catastrophe happened. So, he had the right to stay there as the legitimate owner of the farm. He changed the name of the farm to Al-Diriya. This was the name of the town where he had to escape from previously.
The Jewish forefather of Al Saud family (Mordekhai) established a guesthouse on the land of his victims and called it Al-Mudaffa. From among his guests and his Jewish family members he collected the hypocrites who supported him. With their help he propagated about himself that he is a prominent Sheikh of Arabs.
He prepared a conspiracy against his enemy Sheikh Saleh Salman Abdallah Al-Tamini who was killed in the mosque of Al-Zalafi town.
After that assassin he was satisfied and lived secured in his permanent home in Al-Diriya. He lived with many women in polygamy and had many children. The children were given Arabic names only. When his offspring grew up, they followed his trace. They joined their forces and under the name of clan of Saud they occupied illegitimately the lands from their owners and massacred those who resisted.
In order to reach their goal, they deceived people or bought them or propagated machinations and lies about them. They bribed with money or women those who had great influence. Among them were those who wrote history notes of the Al-Saud family deceiving historians who wanted to make research on the origin of the dynasty. Finally, they originated themselves from the most genuine tribes of Arabs like Anza, Rabi’a and Al-Masaleekh.
It is very strange and hypocrite to give name for the libraries of the Kingdom of Saudi Arabia after Mohammad Amin Al-Tamini. This person prepared for Al-Saud a family tree which goes back to Prophet Mohammad (PBUH) as their ascendant. He got 35.000 Egyptian Pound for that job from the ambassador of Saudi Arabia in Cairo in 1943. The name of the ambassador was Ibrahim Al Fadel. As it was mentioned before the Jewish forefather (Mordekhai) of the royal family lived with many women in polygamy and had a lot of children. Even today the same is going on.
The first son of Mordekhai was called Maqaran. The first son of Maqaran was Mohammed and his second son was Saud who gave his name to the dynasty.
The descendants of Al-Saud achieved a chain of assassin against the prominent leaders of Arabic tribes blaming them with apostasy, leaving the teachings of Islam and Quran therefore deserving death penalty.
On the page 98-101 of the history book of Al-Saud the historian of the family mentions that all who lives in Najd province are in blasphemy therefore they have to be killed, their lands have to be taken away and their women should serve as slaves. This decision cannot be taken on the bases of Quran. Only Mohammed Ibn Wahab can legitimate this kind of rule by his own way of Islam. His roots also go back to Jewish ascendants in Turkey.
The vahabi teachings gave legitimacy for Al Saud to kill everybody who is crossing their way no matter men or women or children. Women were raped and hands of children were cut off and pregnant women were pierced in their womb. This all is legitimate according to the vahabi sect against those who are not vahabis.
The Al Saud family did and still does all of that under the name of an anti-Islamic ideology where people are terrorized and killed.
Al Saud dynasty achieved brutal atrocities in 1749 when they called the whole Arabic peninsula after Al Saud as if it belonged to them like a real estate where inhabitants were all their slaves. Their duty is only to serve the dynasty while Al Saud has the exclusive right over the natural resources. Anybody who opposes the despotic rules and raises his voice against Al Saud is supposed to be beheaded in public.
Once a princess from Al Saud visited with her companion Florida where she took 90 rooms at Grand Hotel and paid for one night 1 million USD. Can anybody blame the princess? Nobody can do it otherwise he will be executed in public. In 1960 the Sawt Al-Arab radio station in Cairo and Yemen radio station in Sana’a confirmed the Jewish origin of Al Saud dynasty. King Feisal Al Saud didn’t deny their Jewish origin as he confirmed it at 17. Sept. 1969 in Washington Post (https://therearenosunglasses.wordpress.com/2014/02/27/wethe-saudi-family-are-cousins-of-the-jews/)

He said: We, the Saudi family are cousins of the Jews. We entirely disagree with any Arab or Muslim Authority which shows any antagonism to the Jews; but we must live together with them in peace. Our country (Arabia) is the Fountain head from where the first Jew sprang, and his descendants spread out all over the world.
That was the statement of King Feisal.
The legal counselor of Al Saud his name is Hafez Wahbi mentions in his book “Arabic Peninsula” that King Abdel Aziz Al Saud who died in 1953 said: “We (Al Saud rulers) sent message to the tribes in order to meet all of them. When they came my grandfather put some of the delegates from the tribe Matheer to jail. When other delegates came from the same tribe asking my grandfather Saud Awal to let them free, he gave order to his servants to cut the head of all prisoners and to cook their meet. They prepared the food from them and that was given to their clan members in order to humiliate them. When the delegates recognized what was given to them as food they were horrified and refused to eat it. But Saud Awal ordered to cut off the head of all who refuse to eat the food. “
That was the way how Al Saud treated innocent people. Saud Awal was one of the cruelest rulers.
Hafez Wahbi wrote another story, too which is related to King Abdel Aziz Al Saud. Once a sheik arrived from the tribe of Matheer to see the king and asking his mercy for a prominent prisoner. The king executed the sheik than he took a bath in his blood than he went for prayer.
The Directorate of the Military Intelligence of Iraq has issued a statement saying that Mohammad Ibn Wahab the founder of vahabiya-takfirya branch of Islam and the Al Saud dynasty who finances the propagation of the ideology of this sect are both descendants of a fanatic Sabbatical Jewish sect from Turkey. The members of this Jewish group practiced Islam in public but in secret they were followers of the cabalistic Judaism. More details here:

http://www.strategic-culture.org/news/2011/10/26/the-doenmeh-the-middle-easts-most-whispered-secret-part-ii.html

Whatever! Which Arab has not kinship with Jews? Regarding religion we have one forefather, Abraham. Regarding genetics they could not avoid to mix. Similarly, I can mention Hungarians and their “genuineness”. Please lift the hand of those in the Carpathian Basin who has not Slavish, German, Turkish, Gipsy, Romanian or other blood in their veins? Impossible to imagine if not! If nations were allies women were subject of inter-marriages, if nations were enemies, women were subject of rape. In both cases the result is the same: women were crossbred by strangers. It is rude but true. See Quran:

And remember, We delivered you from the people of Pharaoh: They set you hard tasks and punishments, slaughtered your sons and let your women-folk live; therein was a tremendous trial from your Lord. (Quran 2:49)

The same thought is here: 14:6, 28:4 and 40:25.

In case Pharaoh gave order to kill Jewish men and using women as slaves the outcome is the following:

• Jew can follow their origin on maternal lineage.
• The nation of Pharaoh achieved cross breeding on themselves and became Jew no matter they wanted it or not.

After all it can be hardly believed if neighboring nations could avoid to mix between each other. And if someone kept his blood “clean” and married uniquely from inside his own kinship he established an inbred lineage what was not able to survive on long term.
This is so simple. Whether Saudis are Jews or not really has no significance at all. On that part of the world every Arab has a part Jew proportion and every Jew has a part Arab or other race’s proportion. This is the genetical map.
Regarding culture everyone belongs to the group where he wants to belong to.