Mainstream Protestant churches have bled members mostly to the Evangelical churches who maintain strict patriarchal structures, preach certitude above all else, the so-called "prosperity gospel," and peddle generally in hate, misogyny, and homophobia - attributes very popular in the age of Trump. However, I'm told even these churches are now on the wane. Apparently when God didn't provide members with their own Rolls-Royce like the preacher man begging for their money, the appeal tarnished a bit.