Hence why Christianity in the USA is in a freefall.
I respectfully disagree. The "mainstream" churches are in a freefall. Lots of Christians are leaving the hedonist "churches" and going to real churches. Those are growing. And some local churches are leaving a hedonist denomination (United Methodist) and joining other serious churches in a new denomination.
Don't fall for the Dim's PR trap where they always make out like their side is the norm and is approved by many.