A better question would be: How can some christians call themselves "christians" and still believe in evolution?
In the very beginning of the Bible there are two stories that tells us how the Earth and everything on it was created. On one story humans were the last lifeforms created, on the other less famous one humans were the first to be created. So by saying that they believe in evolution they would say that they don't believe in the second story.
Now, an even better question would be: How can people still be christian even when science and pure moral has proven the Bible to be completely incorrect?







