I hope I'm not stepping on anyone's toes, but frankly, the people I've known who were into "polyamory" just liked sexual escapades more than they liked being there for one person.

I'm not against polyamory; for people who want to live that way, and who do it without cheating, that's dandy. But I believe it is almost always to the detriment of deep, long-term, committed relationships. (Case in point is one polyamorous friend of mine who wants to find a wife for an "open" marriage. He's in his 40s, been through many girlfriends, and found no takers so far.)

Personally, I don't think you should worry about whether this has anything to do with your past religion. Religion sets rules on so many things--it'd be awfully hard to disagree with all of them!