What are universalizing religions and ethnic religions? Why does one reach more people than the other? Provided examples of both. By far the most practiced universalizing religion is Christianity. Islam and Buddhism are other large universalizing religions. About 62% of the world's population identify with a universalizing religion, with about 24% adhering to an ethnic religion. By its definition, ethnic religions are found near the hearth but spread through relocation diffusion. Unlike universalizing religions, ethnic religions haven't spread primarily because of the lack of missionaries. In some cases, universalizing religions, like Christianity and Islam, replace ethnic religions.