I am a devout christian and my husband and I even live in a monastery. My snake is not associated with the devil, he is one of God's beautiful creation. That is just silly...
I've just had alot of people say something along the lines of "you'd better be careful", and I say "about what?" and they say "salmonella", or "you'll need to suck out the venom if he bites", or "he'll strangle you", or "he'll get out and eat your children and you when he gets bigger"... And then I just take a minute to educate them (gently, not condemningly) about my snake.
Sometimes I just simply say "Ah. Well, thanks for your concern." and then drop it.