I don't know if this is true for most, but I get the feeling that people of faith that rely on an ancient text saying that since it's such an old text it must be true (that statement has its own issues but that is for a different thread) but what about religions that did not have an official text? Why does a religion that is written down suddenly become more valid to believe in? If Christianity, Judaism, or Islam had not been written down, would those who practice it follow it? I don't know if any other religion has an official text since the majority of my religious knowledge lies with the Abrahamic religions.
It's just a question that just came up.
It's just a question that just came up.