The most fundamental difference between progressive Christianity and orthodox Christianity is not about sexuality, politics, or social justice — though those are where the differences often become visible. It is about the Bible. Specifically, it is about whether the Bible is God's authoritative word or a human document that reflects the spiritual journey of ancient communities.

Everything else flows from this.

Progressive Christianity generally holds that the Bible is a human book — written by people in specific historical and cultural contexts, reflecting their understanding of God at that time. It is inspired in the sense that it contains genuine spiritual wisdom and has been meaningful to countless people across centuries. But it is not authoritative in the sense that it stands over human judgment and culture.

This means that when the Bible says something that conflicts with contemporary values — on sexuality, gender roles, judgment, or the exclusivity of Christ — the contemporary value wins. The Bible is read through the lens of modern ethics, not the other way around.

Progressive theologians often describe this as "reading the Bible seriously but not literally" or as recognizing the "trajectory" of scripture — the idea that the Bible itself shows a movement toward greater inclusion and justice, and that we should continue that trajectory beyond what the text explicitly says.

It makes the reader the authority, not the text. If the Bible is authoritative only where it agrees with contemporary values, then it is not actually authoritative at all. You are simply using it to confirm what you already believe. This is not reading the Bible — it is reading yourself.

It is historically selective. The "trajectory" argument — that the Bible is moving toward greater inclusion — requires choosing which trajectory to follow. The Bible also has trajectories toward holiness, judgment, and the exclusivity of Christ. Progressive Christianity follows the trajectories it finds appealing and dismisses the ones it does not. That is not a principled hermeneutic. It is a preference.

It is not what Jesus believed about scripture. Jesus treated the Old Testament as authoritative and binding. In Matthew 5:17-18, he said he came not to abolish the Law and the Prophets but to fulfill them, and that not the smallest letter would pass away. In John 10:35, he said "scripture cannot be broken." Jesus did not treat the Bible as a human document to be evaluated by contemporary standards. He treated it as God's word.

It is not what the New Testament claims for itself. 2 Timothy 3:16-17 says "all scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness." 2 Peter 1:20-21 says prophecy did not come from human will but from people "carried along by the Holy Spirit." These are not claims about human spiritual wisdom. They are claims about divine origin.

Progressive Christians often point out that the Bible was written by human beings in specific historical contexts — and that is true. The question is whether God can work through human authors to communicate his word reliably. Orthodox Christianity says yes. Progressive Christianity effectively says no — or at least, not in a way that produces a text with binding authority.

How to respond: "I agree that the Bible was written by human beings. But I think God can work through human authors without the result being merely human. The question is not whether humans were involved — it is whether God was. And if Jesus treated the scriptures as God's word, I think that should carry significant weight."

This is true. The Bible has been used to justify slavery, the oppression of women, and violence against LGBTQ people. Progressive Christians are right to be troubled by this history.

How to respond: "You are right that the Bible has been misused — and that is a serious problem. But the solution to misuse is not to abandon the authority of the text. It is to read it more carefully and honestly. The people who used the Bible to justify slavery were not reading it well. The abolitionists who opposed them were also using the Bible — and they were reading it better."

The authority of scripture is not a secondary issue. It is the foundation on which everything else rests. If the Bible is not God's authoritative word, then we have no reliable access to who Jesus is, what he came to do, or what it means to follow him. We are left with our own preferences dressed up in religious language.

That is not Christianity. It is something else wearing Christianity's clothes.