I suspect most of the time, non monogamy via religion is going to be shitty. It’s probably going to favor men and be controlling.
I know many people who do consensual non monogamy in real life. Personally I don’t like the DADT or strictly-hierarchical modes
People who aren’t familiar with it say some pretty wild things about it.
My take is if you can have multiple friends, and you’re okay with your friends having friends, you’re like 80% of the way there.
The last 20% is likely to crash into “it just is, stop asking me to introspect this is uncomfortable and I’m mad!”