Why arguing about religion is futile

Over the past few months the number of arguments, debates and discussions I've had on religion has been exponential - since I decided to fully reject the idea of a god, it seems like the opportunities arrive daily. And, god (no pun intended) it ain't easy. Hitler was a Christian … Stalin was an atheist. I'm sick of hearing those two names. The first thing people have to realise is that in their purest forms, neither religion nor atheism promotes immoral behaviour. As someone who has spent a large part of their life as a Christian, I'd define the fundamental nature of each as follows.