Book excerpt: What would happen if Christians and a Muslim at a university talked and disagreed, but really tried to understand each other? What would they learn? That is the intriguing question Peter Kreeft seeks to answer in these imaginative conversations at Boston College. An articulate and engaging Muslim student named 'Isa challenges the Christian students and professors he meets on issues ranging from prayer and worship to evolution and abortion, from war and politics to the nature of spiritual struggle and spiritual submission.