You sure are putting a lot of words in my mouth.
CHEATING is a moral stance. Two people enter a relationship with an assumed monogamy, I expect them to be respectful to each other. I have a moral stance against cheating, not polygamous people.
The fact that so many of you conflate the two makes me think you guys think being poly gives you license to fuck whoever you want without caring about if it might hurt someone.
You do not get to fuck whoever you want just because they want to fuck you. Sorry to bring reality to sex.
E: are you really trying to say that taking a moral stance on something is inherently religious?