You can't go by Hitler's public speeches if you want to know what he really thought. His private utterances in "Table Talk" reveal his true feelings about Christianity. He despised it. He particularly despised Christian ethics. He also had some crude Darwinian ideas.
The authenticity of "Table Talk" is accepted by eminent historians. Hitler had a secretary copy down what he said during those private gatherings. The purpose was the edification of posterity.