Discussing God is a completely practical taboo, though.
Most people, perhaps all people, don't arrive at their opinion on religion through rational thought. I make this claim due to the obvious fact that there are a lot of contradictory religious beliefs out there, and if most people used rational thought then you'd expect most people to have similar beliefs. They don't, thus most people aren't rational about it.
Since most, perhaps all, people are irrational about it, there's no point in discussing it. It's just going to cause anger and pain. Better to avoid it.
Most people, perhaps all people, don't arrive at their opinion on religion through rational thought. I make this claim due to the obvious fact that there are a lot of contradictory religious beliefs out there, and if most people used rational thought then you'd expect most people to have similar beliefs. They don't, thus most people aren't rational about it.
Since most, perhaps all, people are irrational about it, there's no point in discussing it. It's just going to cause anger and pain. Better to avoid it.