Kuran was so influenced by the Jews holy book that Muhammed burrowed some Jewish practices for Islam:
Not to eat pig. (Jews do not eat pig, a tradition before Muhammed was born.)
To cut foreskin of Pe*nis. (Tradition of Jews before Muhammed was born.)
Concept of Adam-Eve. (Story written by the Jews.)
When some people try to say that Muhammed started the above practices (not eating pig, cutting foreskin etc), i just feel pity for their lack of knowledge.
Specially when they try to give some "scientific reason"!