"A person's religious faith, or lack of such faith, is not an indicator of whether than person is moral or immoral."<quoted text>
Even if Hitler was an atheist, his atheism did not cause him to committ his crimes against the Jewish people, and atheism did not cause him to launch unprovoked wars of agression. Hitler had an unreasoning hatred and suspicion of Jews. So did the Protestant reformer Martin Luther.(Luther also advocated the destruction of the Jews.)
And plenty of non-atheists have launched unprovoked wars of aggression. The so-called Christians who decimated native American tribes in the U.S. during the 19th century are juts one example. In 2003, President George W. Bush ordered an unprovoked attack against Iraq, and yet he loudly proclaims himself a Christian. I am an atheist myself, but I have never committed an act of aggression against anyone, nor do I have any desire to do so.
So no, a person's religious faith, or lack of such faith, is not an indicator of whether than person is moral or immoral.
The 20th century was ravaged by atheist mass murders Hitler, Stalin, Mao, Eichmann, Trotsky, Ho, Himler etc.