Religion is a never ending discussion, so I avoid to talk about it unless the person I am speaking with is seriously interested, in that case a serious debate might happen.
I don't agree with that tournique, I mean, we can discuss religion, but if we start that discussion we need to be prepared that we will not reach a logical conclusion, because there isn't one.
Religion can often become a problem to handle especially if you talk with older folks. While I understand that there is no one sided conclusion, stubborn people may have problems dealing with this topic.
