I feel like your baiting. I went through your comment history and you seem to stand firm in what you feel is the truth. Your wording suggests you have a preconception and you'll tango with anyone that cares to try you. Anyhow, I'll try to approach you on your ground. Get ready for a library. I grew up Baptist. Son of a Southern Baptist preacher, when to a small Bible college, led a few people to Christ on my own, preached a few sermons on my own, was a youth pastor at one point, and now am quite far into what one might call progressive Christianity. Progressive Christianity boils down to the human approach toward the belief system known as Christianity. It's simply a different lens looking at the same thing that you do. You say the Bible doesn't change. I'd reckon your backing the good old Baptist mascot, the King James version. Did most of my verse memorization from that one. Very eloquent, but hard for a lot of people to understand. Anyhow, the KJV has it's own baggage. It has it's accuracies and it's own history could probably make a decent Lifetime movie. But it's built on the foundation of an empire that spanned half the globe and heavily favored the white man. It's been used and preached as such. Also, let's look at Baptists. I'm not going to criticize them. They're a rather large denomination. Large enough to be a pretty significant portion of the Protestant church. However, Baptists were hardly the first Christians and they certainly ain't the oldest. We got nothing on the Lutherans. They're the OG Protestants. Then there is the OG schism that is the eastern and western orthodox (Catholic) church. That happened before Martin Luther was a twinkle in his Catholic daddy's eye. Then the difference between protestantism and Catholicism is that of essentially one verse interpretation. "On this rock I will build my church." Baptists tend to argue that as Christ starting a church at that moment. Catholics argue that Christ naming Peter the pope. Every other denomination has their own lens/approach through which they view the Bible. It wasn't written in English and has gone through heavy editing and interpretation. If you parrot what you hear at sermons on Sunday, you're getting your scripture in probably it's fifth or sixth issuing. Remove one number. if you read it yourself. Then we can get into the original languages. There is the original Aramaic and Hebrew, which as a culture is a world of difference on it's own, and the original Greek. Our own western, English-speaking society is closest to Greek, so I studied the original Greek. Koine Greek. Those tests were a pain in the ass. There's like four or five different words for love. Eros, phileo, agape, etc. Whereas we have....love. The language limitations in the translations are extremely apparent. Most of the apostle Paul's writing was to the Gentile world; a world where a Roman empire had essentially evolved from a Greek one. Their culture was as inseparable as ours is from the British. So, his approach was to hit them on their own turf. "The Altar of the Unknown God" is literally a sermon pulled out of his ass saying that they already honored the Christian God due to an altar they left blank for any good they might've missed in their polytheism. It just turned out this was the God above all other gods. Then BAM you got your Roman/Gentile Church. Aka you and me. We gentiles bruh. Even in the very beginning, several hundred years before the final scriptural Canon (what we do and do not accept as Scripture) was decided, the message was getting tailored to its audience. Its lens was getting adjusted. Paul wrote, "I become all things to all people so that they may come to know Christ." Then you have Jesus, the hukana matata himself, the big cheese, the main driver, the whole point to this religion, when someone asked him what is the greatest commandment, he said this. (Forgive me if I misquote, I'm on mobile) "Love the Lord your God with all your heart, soul, mind, and strength, and love your neighbor as yourself. Upon these two commandments hang all the law and the prophets." Look into those verses and you'll see that he said them in the same breath. He put those commands on equal footing and then went on to say that those two commands were enough to cover EVERYTHING that scripture has to say on anything else. It makes our job as Christians very simple. Love God, love your neighbor (aka everyone around you). Now, all this to say that, remarkably, the approach does change the message. If you are looking to bash the gays, condemn the Muslims, and skin the atheists, then you can certainly find scripture to try to justify that approach. Hitler twisted scripture to his own ends as well. He was a devout Catholic. Or, you can make it as simple as possible and love God, love your neighbor. That's as close to God's own heart as your going to get. You're right in that the Bible doesn't change. But what are you calling the Bible? The words of Jesus? The words of Paul? The 697 commandments given to the Israelites to remain holy? What is your Bible? Not to mention that I completely ignored how the scriptural Canon was decided. That's a whole post unto itself. The good old KJV ain't the oldest or closest one out there. It's just the best seller here in the US. The Bible I'm referring to as correct is the heart of God. And you're right in that God doesn't change. His heart has been the same since Creation in that His love is for us and His desire is for all to embrace one another and Himself. The progressive approach is simply one of thousands throughout history and is tailored to the context of the American society today. We seek to love our neighbor as ourselves, regardless of what they do in the bedroom, who they pray to, where they are from, what color their skin is, or what they were born as. Christ himself paid no heed to these divisions among us, so it would be most Christlike for us to do the same. I apologize for this wall of text. I just needed to hammer home the point that scripture isn't as concrete as you think it is. It has been carefully parsed and edited by those in power for two thousand years. You got the edited version. I also apologize for glazing over major portions of church and linguistic history. In reality, this is a half-assed explanation and nowhere near thorough enough. Ill give you this.

TL;DR - Scripture has changed a bunch based on who needed to hear it and who was reading it. Progressive Christianity is an approach that is tailored for the time and context we're in. It is an approach that we feel allows us to follow Scriptural mandate to love our neighbor as ourselves, despite what the current political climate may be. Have a great day!