I hope that the internet will open Islamic society to Christian teaching, even classical philosophy. I know someone who corresponds with Muslims in north Africa over the internet. He told me that they frequently say things like, "We don't have to believe these things?" The idea of freely accepting or rejecting specific religious doctrines is a strange idea to them.
Another obstacle to Muslim conversions is psychological. Because the Koran contains contradictory passages, and because the Koran is treated as the literal word of God, Koranic teachings must be accepted on blind faith, and in contradiction to natural reason. So Muslims must also overcome a lifetime practice of sublimating contradictions.
Funny, I had a conversation on FR just yesterday with a Lutheran minister, and he pointed out that the flaw in Calvinism is its reliance on humanly limited reason in building the doctrine of double predestination.
I agree on your main point. That is why I think that we won't see conversions to Christianity in any great numbers, but we do see acceptance of Western practices that are a consequence of Christianity: free thinking, tolerance of diversity, bourgeois work ethic, tolerance of small vice.