Evolution and Christianity are perfectly compatible unless, of course, one is a Christian of weak faith.
Evolution and Christianity are perfectly compatible if you believe the Bible is only allegory, that it doesn’t really means what it says.
I think the weaker your faith, the more you will crave certitude. You will even go out of your way to invent things about which one must be certain and make legalistic claims for your inventions. This way you can convince yourself of your superior faith.
There are some things in the Bible that we don't know the exact meaning of, and there are disagreements about what can be read literally. And some who claim to read the Bible literally are not really reading it literally - they read current events and contemporary American culture into the Bible, as if the Bible has no historical context from ancient Israel or the early Church. Many claim to be experts about the future, and they have invented very detailed timelines, but they disregard history. Then there is science that we think is pretty much settled but things might look different in 100 years as more things are discovered. So the dogmatic atheist might find much to be disappointed about, just like the believer in certitude who has God all figured out is in constant fear of losing his faith.