What slightly worries me about what you are saying is that you seem to be imputing this preacher's words into Obama's philosphy.
I think you need to make your case out of Obama's words.
He was raised by his white mother and abandoned by his Kenyan father. So I rather doubt he holds the racist opinions I presume you think he is concealing.
Heck, I have Christian friends. Christianity has done a lot of harm to Moslems in its time. Does that make me a hater of Moslems?