Most mainline Protestant churches are nothing more than social clubs where people throw around vaguely Christian language now and then to feel good about themselves and virtue signal. Some are even borderline agnostic are just places where normal people who are freaked out by hand waving and "fire and brimstone" preaching go to share their more private, reserved faiths in God and Jesus with each other ... they also occasionally use common sense to see some Biblical stories as allegory and don't care if the psychos down the street at the evangelical "church" think they're less Christian for this basic level of intelligence and non-cultish attitudes.
Always rich when these much newer evangelical religions trash Christian faiths that have been around for so much longer because they're not weird enough.
EDIT: I won't delete anything, as I guess I typed it once so I had to have sort of meant it ... but I'm sorry if I overreacted there. It's just really annoying to have anyone else tell you that your denomination's teachings which you've grown up with in your family for a long time or that your personal relationship with God is any less legitimate than someone else's, especially when Mainline Protestantism has been the traditionally dominant belief system in this country for decades prior and isn't some strange new twist on Christianity (if anything, that's evangelicals, especially new age ones).
The problem is, that the institutions have been traditionally dominant, but the belief systems currently holding sway in them are new. There is a lot of talk in the PCA and ACNA about how "I didn't leave X, X left me". There's been so much change in mainline theology that many of those denomination's founders and early leaders would be unwelcome now. It's hard to imagine
J. Gresham Machen for example ever getting ordained in today's PCUSA.
From a confessional Protestant point of view, the pedigree of Schori and Spong is only marginally older than some Pentecostal rolling around on the floor.
