(The title's meant in jest, so the easily-offended need to chill.)
You may be familiar with the comedian/entertainer Penn Jillette, either from his two-man illusionist act "Penn and Teller" or from his various cable shows and other speaking and writing events. Sharp guy, funny guy, intellectually honest, and hardcore athiestic. An athiest evangelist, if you will, but with enough of a head on his shoulders to recognize rhetorical/political nonsense (which puts him at the front of the line ahead of guys like Bill Maher).
I happened upon this video diary of his, about a man who gave him a gift of a Bible recently, and his reaction to it. During this video, Jillette explains what he believes about personal belief and "evangelizing" (he uses the word "proselytizing") for it. In this five-minute video, he grasps the urgency of spreading a faith message better than many Christians do. And I have to say, I was surprised. Listen to the whole thing, but pay close attention at around the 3-minute mark.
The other thing I get from this is how vitally important it is that Christians treat other people with respect and kindness, and use words seasoned with salt. Because if we treat non-believers, even (especially?) those out-right opposed to our faith, with that kind of dignity and love, we will be living lives worthy of the One whose name we bear, and some may even be won over by that love.