Why did the Nazis dislike Christians?

The Nazis were Christians, so they didn't have a problem with other Christians except for nationalistic reasons.

Some direct quotes from Adolf Hitler:

"Today Christians ... stand at the head of [this country]... I pledge that I never will tie myself to parties who want to destroy Christianity .. We want to fill our culture again with the Christian spirit ... We want to burn out all the recent immoral developments in literature, in the theater, and in the press - in short, we want to burn out the poison of immorality which has entered into our whole life and culture as a result of liberal excess during the past ... (few) years."

"National Socialism neither opposes the Church nor is it anti-religious, but on the contrary it stands on the ground of a real Christianity . . . For their interests cannot fail to coincide with ours alike in our fight against the symptoms of degeneracy in the world of today, in our fight against a Bolshevist culture, against atheistic movement, against criminality, and in our struggle for a consciousness of a community in our national life . . . These are not anti-Christian, these are Christian principles!"

The Nazis disliked atheists, though:

"We were convinced that the people need and require this faith. We have therefore undertaken the fight against the atheistic movement, and that not merely with a few theoretical declarations: we have stamped it out."

"Secular schools can never be tolerated because such schools have no religious instruction, and a general moral instruction without religious foundation is built on air; consequently all character training and religion must be derived from faith..."