Start by reading
http://sunnianswers.wordpress.com/2008/05/19/the-foundations-of-the-religion/ including the comments. You can also read this:
Answer to Atheists
Sunnis believe that two completely opposite ideas cannot both be true, and use this idea to show the truth of their beliefs. The Wahabis beg to differ and attack the use of the mind:
Agnostic Contentions: Randomness and Infinity
Q & A: Someone asked, “Is Islam Falsifiable?”
Q & A: Someone asked “How do random things relate to the existence of God?”
Q & A: Someone asked, “If God is perfect, then why are certain things, for example the eye, imperfect?”
Responding to Atheists – A Collection of Posts & Comments
Deviant attempts to use theories of physics against the proofs of the belief of Islam
Darwinism in the eye of the mind
That being said, there is not much point in talking to people who have no interest other than mocking.
AAA