Many people confuse Progressive Christianity with liberal Christianity. They’re not the same thing. Progressive Christianity is halfway between conservative Christianity and liberal Christianity.
Liberal Christianity
Liberal Christianity is committed to changing things according to a liberal perspective. Conservative Christianity is very resistant to changing anything, and wants to keep things the same.
Progressive Christianity
Progressive Christianity is the middle way that follows the evidence where it leads. It conserves what needs to be conserved, and changes what needs to be changed.
Think of progressive Christianity as the middle way, between ultraconservative and ultra-liberal. Truth is not conservative or liberal, but consists in the claims that match actual reality.
Unity in Essentials
The guiding principle of progressive Christianity is, to paraphrase St. Augustine, in essentials let there be unity, in non-essentials let there be liberty, but in all things let there be love. The essentials are spelled out in the Nicene Creed.
Progressive Christianity
Lots of different people claim the same label. I can only tell you what I mean by the term. I do not have the authority or the desire to police the term. People can call themselves whatever they want.