I think it's important to keep in mind that love & compassion are at the foundation of all the world's religions. Coming to terms with our own spirituality is a quest on it's own. As Quath alluded to, it's also good to keep the 'big picture' in mind when it comes to religion & spirituality and not get too tangled up in 'specifics' that were written hundreds or thousands of years ago for a different culture (un-evolved) in a different time.
The concepts behind polyamory are not in conflict with living a moral, ethical life. Quite the contrary. Study it - absorb as much as possible - and you'll find that in theory there is no conflict.
In practice - well, like anything else - it takes practice.
Enjoy the journey
Be kind to yourself and everyone else.