How could Genesis hint about the extinction of the dinosaurs? Genesis doesn't even mention dinosaurs, does it? As it turns out, Genesis is a much more comprehensive account of creation that it is commonly given credit for. Many Christians consider the King James Version of Genesis to be the literal history of creation regardless of scientific theory and others consider Genesis to be poetic or allegorical in nature. It seems that very few people consider that all of these things may be reconciled, you can read more about that in these articles on The Big Bang and Evolution, but for now, let's focus on dinosaurs!
Evolution is something that has troubled a great deal of Christians and swayed a many people from accepting the possibility of a Biblical God. I think the biggest reason for this is that theologians have historically had a certain way of interpreting the Bible and are not strongly convinced by the evidence for evolution. This lack of conviction in the scientific theory causes people either question science or question their faith. I think that this is a mistake.