You really don’t know why many of the open religion threads so quickly descend into the worst bickering?
It’s because people want to be right.
I don't think it's that simple. I want to be right as much as the next person. In fact, I believe that I am right, regarding the major points of my religious faith (Catholic). (I also think I've probably got some things wrong, points where my understanding of my Faith is erroneous.)
However, I don't feel a need to engage in hostilities with people who have other beliefs. I'll engage in discussion, but if I find myself writing in a way that I wouldn't act in Real Life, I stop myself. I agree with Judith Anne that it is an occasion of sin to participate in discussions that are going to stimulate anger, hatred, or unladylike displays.