Too dangerous to be fair? No interest in anything other than your religion? Limited knowledge is safer and better because well ya never know another religion might offer something yours doesn't and oh my gosh how evil is that? We get it. Your way or the highway right? Where did we hear that before?
Although I am an atheist, I think it would be very beneficial for people to learn about different religions. It might just make us more accepting of people who are different from us because we have a better understanding as to why they believe the way they do.