Yet they’re all no doubt firmly convinced that they’re Christians. Sad.
They are as certainly correct about that as you are. Did God instruct you to look down your nose at the Hillbillies?
Someone who’s met the gospel requirements for receiving Christ ceases to be Christian because they have an error that particularly offends modern sensibilities?
I don’t think so. I think they grieve the Holy Spirit, but I don’t think they cease to be what God himself has deemed to be Christians.