Second, it is ok if traditions like circumcision were in Judiasm , because we believe in Judiasm !! , We believe in Moses and Jesus . Muslims Believe in all previous prophets with no exception because we know (from Quran) and believe that all prophets since Adam to Mohammad , all of them called for the same idea which is the one God , the good work and to believe in the life after death . Prophets differed in details but not in the basics . And in the case of Judiasm , we believe that Jews changed the Torah because they calim that Allah (the God) has a son !! , and they claim many other lies and Quran told us that Moses believed that God never had a son . And this is just an example .
First off, if you believed in the Prophets of the OT, and in Christ, you would not be so desirous of killing of all the Jews, and you would either be a Jew, or a Christian, not the follower of such a murderous cult as Islam is.
Next, the Torah does not teach that God had a son. You are referring to the verses in Exodus 4:21,22 when the Israelites were under the captivity of the Egyptians, and God said to Moses to tell the Pharoah "Israel is My son, My firstborn" in reference to the nation of Israel, not Isaac.
Now, if you are referring tolies, I would seriously doubt that the Angel Gabriel would have told Mohammed to kill all of those who do not believe in "Allah". Nor do I think he would have told Mohammed to violate most all of the Ten Commandments, and if you believed in Moses, or Christ, you would not believe in such.
As to the origin of the Qur'an, here is how it happened:
Islamic belief holds that the angel Gabriel spoke the Qur'an to the prophet Muhhamad and was ordered to recite (because he could not read or write). Muhammad later taught the Qur'an to the followers he gained shortly thereafter, who wrote these teachings on anything they could find, such as bark or leaves, or paper if available. After Muhammad's death, Abu Bakr compiled these teachings to form the original Qur'an which was copied and spread by the Muslims. As time elapsed differing copies of the Qur'an appeared. This was a huge issue because of the Islamic belief that the word of God could not be corrupted, and the 3rd caliph after Muhammad's death, Uthman, ordered that all copies of the Qur'an be gathered. They studied each text, and what was deemed as original was compiled to make the Qur'an we see today. All of the manuscripts and parchments or bark and leaves were then destroyed to prevent further corruption,
the only issue being that now we have now way of performing a textual study to actually show that the current Qur'an is the original.
http://www.answerbag.com/q-view/31317
So, if you doubt the Toran, and thus the Bible, how can you believe the Qur'an