Over time, living religions change. I think Judaism is a good example.
Take a Jew from 5,000 years ago. He is a nomadic member of 12 tribes, and he knows which tribe. His tribe.
2,000 years ago, Temple Judaism was still around.
In 1492, Spain was the center of Sephardic Judaism. The dispersal had nothing to do with the Temple. Neither did the other Orthodoxies that developed in different areas of Europe.
The Non-Orthodoxies that sprang up in the 19th Century were a major shift.
Diversity has continued. The World now has Humanistic Judaism, which is not easy to describe. And the Jews for Jesus, which is even harder to explain. Hasidic Judaism, in different forms, is on the increase.
Christianity has also changed over time. So has Islam. So has Vedanta/Hinduism. So have the different Polytheisms.
We can NOT go by what the founders had in mind. That is not how the world works. Only dead religions don't change.