The “Christian” Left likes to refer to itself as “progressive,” but as documented in Pyromaniacs: The Lie of “Liberal” Theology, these movements have been around since Jesus walked the earth.
The legacy of such movements is clear—or it ought to be. No good has ever come from the liberalizing tendency. It is rooted in a way of thinking that is hostile to the authority of Scripture; it inevitably corrupts the simplicity of the gospel of grace; and it fosters skepticism and (in the worst cases) rank unbelief.
Just read the comments section at places like this and try to suppress your gag reflex as these “Christians” make up things as they type.