Many religions believe one should take God's existence on faith alone. I have trouble with this concept. I'm too much of a realist, I guess. My wife is Catholic. I've often gone to mass with her and I even took Catechism classes before we married. What I learned was that there was no way I could be a Catholic, I couldn't even fake it. It's fine for her to believe as she chooses though. I have no problem with other folks following their religious teachings unless they try to preach to me.
Where do you draw the line on "preaching" vs "not preaching"?