You're correct about polygamy tending to flourish within misogynistic, inbred religious extremist cults. Polygamy doesn't bother me in the slightest. What bothers me are people twisting religious custom into a mask for evil and abuse. Evil hides in all sorts of places where there's an unbendable power hierarchy - Sports teams, Boy Scouts, the armed forces, Residential Schools, etc.

The Shafia trial has just ended not far from where I live. Members of the Muslim community repeated the same message: this is not about religion, this is about abuse -- abuse of women and abuse of power. I heard over and over again from devout Muslims that the only people who would interpret the Koran as condoning 'honour' killing are certifiably insane.

Back to the original topic, gay marriage. Like it or not, an inclusive society must by definition include many conflicting opinions, even bigoted ones.