Noted atheist (anti-theist, really) Christopher Hitchens was once interviewed by Unitarian minister Marilyn Sewell.
The following exchange was enlightening:-
Sewell: The religion you cite in your book [God Is Not Great] is generally the fundamentalist faith of various kinds. I’m a liberal Christian, and I don’t take the stories from the scripture literally. I don’t believe in the doctrine of atonement (that Jesus died for our sins, for example). Do you make any distinction between fundamentalist faith and liberal religion?
Hitchens: I would say that if you don’t believe that Jesus of Nazareth was the Christ and Messiah, and that he rose again from the dead and by his sacrifice our sins are forgiven, you’re really not in any meaningful sense a Christian.
Sewell: Let me go someplace else.
Interesting, isn’t it, that one of the world’s most notorious unbelievers had a firmer grasp of what Christianity is all about than one of its putative representatives?