I'm christian. I know that we can sometimes come across as annoying, but we have a very good reason for trying to convert every single person that we meet, and I think this video sums it up pretty nicely.
If you believe in all this stuff, and that it's your belief that allows you to go to heaven, and lack thereof that keeps you from there, and therefore sends you to hell, how much would you have to hate someone to not talk to them about it, to not try and get them to believe?