I agree with drawing your own line and standing by it, but I remember someone saying that we are in this world, not of this world...
I feel that, sure, each and every Christian if they wanted to avoid the nasty stuff in this world, had better go build a stone building to go study the Bible and make cheese and candles in.
We are supposed to be ambassadors for Christ no? Just because there is ugly stuff in this world and people doing ugly things, doesn't mean we should decide we ought not be around it, afraid that it will magically jump on us and make us to sin. Now if your a person weak enough to be tempted by such things, then by all means stay away. We are to take God's light and reflect it into the dark corners of this world, to the people that need God the most. I guess what I'm trying to say is, I was taught we are to make a difference in this world, in all the things we do.
I have played a couple of MMOs that include worship of "gods" in the lore; but you know, if I had made the choice not to buy those games, I wouldn't have had the opportunity to lead someone to become Saved. (true story)
Pray about it and hope your lead of our Loving Father.