I disagree slightly, as there seem to be virtually no polygamous dating relationships
Polyamourous is totally different. That is when you love and are intimate with multiple people. I agree that is fairly rare in christianity. Thats not what I am talking about.
I am talking about dating multiple people, at the same time, because you havent falled in love with or been particularly intimate with any one of them. This isnt polyamoury, this is just dating people.
Dating multiple people before committing to any one person is absolutely very common int he christian community, and very much the norm.