Honestly, not all people, and definitely not all Christians, are as small minded as you believe. I have only had one person at my work ever actually worry over my immortal soul, and his solution was to give me a bible I keep and use to this day. I have even had the pleasure of talking with my boss about the energy in crystals and how they can effect you.
My grandfather, a very Christian man, doesn't care what I believe in, as long as I believe in something. He respects that I do not believe as he does, and would rather see religions all as extensions for each other.
Just remember that not everyone is over the top foolish, and not everyone is out to get you. Worrying about what other people think of you isn't helpful to you at all. Worry about what you think of you. Are you a devil worshipper? No? Good for you. Don't even bother to react to things that are said in real ignorance.
"Arguing with stupid people is like playing chess with a pigeon; no matter how good I am at chess, the pigeon is just going to knock over all the pieces, crap on the board, and then strut around like it won."