Hitler was wrong according to secular morality and according to religious morality. A species without a certain amount of morality (within its own species, the morality of treating other species is a very different topic) is not going to get very far (if all humans were murderers, humans would die out in a single generation). Our morality does not require a god, it starts as a means for survival of the species, leading to sympathy. Later with education and social etiquette, these morals have been written down and enforced. If the only thing stopping you from rape and murder is your belief in a god, then please keep believing
