You wrote, “Christianity long ago degenerated into individualism and relativism. This is the nature of sola scriptura.” I disagree. Sola Scriptura would result in unity, not division. When people insert their own views, adding to Scripture, that is when division occurs.
For example, Peter was the first Pope. Where is that found in Scripture? It isn’t. Where do we read about a pope in the Bible? By adding that as a belief, something not found in the Bible, division is caused. Any idea not supported by the Scripture will result in division.
Christians need to rely only on the Bible. If we do that, although there will be disagreements, we will be closer than if we accept teachings that are not in the Bible.