The most significant reason I've observed over the past 56 years, is that Feminism benefits from the religious castration of We the [conservative] People's ability to wield Logic and Reason, supported by reproductive science.
Fallible and uninspired self-worshiping theocrats, whose world view is propped up the silly notion that the world is only 6000 year old, have assumed dominion over the faith of others.
Young folks who, like Galileo, believe what their own eyes and free minds see... tend to, sometimes, being misled into tossing the baby with the bath water.
The baby in this case being - Marriage, which is modeled after Christ's relationship with His body, the Church; constituted by free Individuals whose personal relationship with Him is not governed by the coercion of the fallible and uninspired's various state-establishments.
Christian Marriage, and its associated reproductive strategy, manifests the highest sociobiological fitness in the history of humanity. Why is that?
Seems to me it's because the Word, the creator of Natural Law, wrote the instruction manual...
Mark 10:6-9 6
NIV