Yes, debating religion is a bad idea for there are many religious people here. That and only few agnostics and atheists and those who are interested. And yes, debate is an argument but it has strict rules of conduct. Everyone gets to be correct if there is no correct answer to the question for what you believe is what matters. We aren't supposed to convince or convert but to learn and listen from others. Religion/Politics discussion may get heated, and some might feel that they are being personally attacked. So i guess the best way is the absence of religion.