"BUT HITLUR WUZ ATHEEST"
The source: [link]
Hitler was raised Catholic, regularly invoked Jesus in his speeches and spoke often of his and the German peoples' "manifest destiny", which isn't very atheist at all. He also thought that he was fighting for God's work by killing Jews, and although he also persecuted the Catholic Church and some Prostestant churches later on, he never ceaed being a theist, in fact, he was actually and always Catholic and was never excommunicated from the Catholic Church and the book "Mein Kampf" was not placed on the Church's index of forbidden books. And yes, the Catholic Church supported Nazis and the killing of the Jews.
And regarding atheism, Hitler opposed it in a 1933 speech in Berlin: "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.”
And due to Hitler's involvement with the Church, he began enacting doctrines of the Church as law. He outlawed all abortion (citation needed?), raged a death war on all homosexuals, and demanded corporal punishment in schools and home, and many times Hitler addressed the church and promised that Germany would implement its teaching: “The National Socialist State professes its allegiance to positive Christianity. It will be its honest endeavor to protect both the great Christian Confessions in their rights, to secure them from interference with their doctrines (Lehren), and in their duties to constitute a harmony with the views and the exigencies of the State of today.” –Adolf Hitler, on 26 June 1934, to Catholic bishops to assure them that he would take action against the new pagan propaganda “Providence has caused me to be Catholic, and I know therefore how to handle this Church.” -Adolf Hitler, reportedly to have said in Berlin in 1936 on the enmity of the Catholic Church to National Socialism
Hitler was actually religious, and yes, the Catholic church is racist, the more you know.
TL;DR: Hitler was a religious dick.