... is you should believe in God. Not only that, but it is my duty to convert you, because I'm sort-of unable to respect your beliefs, unless they're the same as mine.
... or something like that.
What is this about? I found an entry on wikihow about ways to convert your friends to Christianity, in an overt way. The list sounds mainly nice, but it ignores a few details, like ... I don't know ... teaching you to be hypocritical with your friends and hide your intentions in the name of spirituality?
How about a number 6 on that list, something about the lines of:
Focus on being honest with your peers and actually tell them you're not interested in their values at all unless you can demolish them and replace them with yours?
How about a number 7, stemming from the Kalam Cosmological Argument (suggested by the wikihow entry): If indeed everything has a cause (the first premise of the argument) then God must have a cause also. If God exists, what makes him/her do so?
How about ... I'll stop here. I don't want to make (much) fun of such a list, but the temptation is there and it's almost too easy :).
As a side note, on my way to Turkey, on the ferry, I've had the dubious pleasure to chat with a Muslim young man, who kept insisting he would convert me to Islam; He was pushy, intrusive and after a while, tiring.
For anyone inconsiderate enough to actually do that to their friends, don't worry: they won't be your friends for long.