>>There is no such thing as a “progressive” Christian.<<
I took that quote to mean Christians who politically were progressive (i.e liberal) rather than non-biblical Christians... I’ll go back and look again.
Once you get to a certain point in your progressivism, you might as well drop the pretense of being a Christian and just go join the nearest Unitarian fellowship.
Christian doctrine and progressivism are mutually exclusive. Churches that are under the sway of these people are being used to mainstream a socialist agenda and to subvert the Church.