According to McGrath of Harlow (16 Oct 05 - 12:37 PM): One thing I hadn't realised until looking something up for this thread is that there is nothing in the Koran requiring circumcision of male Muslims.

I'm no expert on Islam, but I do know that male circumcision is required in Judaism. I also know that in McGrath of Harlow has said in Middle East threads that Judaism and Islam are essentially the same religion.