Many “revealed religions” depend on prophets and holy texts to get their messages out to people: in order to figure out what God wants, you either have to read this holy text or have a class of priests that read the text tell you what the text says.
But this is a form of cultural diffusion: whether or not the text is available to you before the modern world (with printing presses and internet) depends on whether you’re born in the region where the book is in print, whether your culture supports the priest class that can tell you what the text says (such as if you’re illiterate), things like this. Even today, we see religions based on particular texts to be somewhat geographically locked as tends to happen with things (like fashion) that are spread through cultural diffusion.
Why would gods choose such an obviously inefficient way to spread their message, especially if (in some worldviews) that message has infinite consequences?
For instance, for a being with godlike power, it would be trivially easy to just implant whatever knowledge is supposed to be gleaned by the holy text directly into every newborn: then it won’t become region locked, people wouldn’t fight over whose holy text is holiest, people wouldn’t be born in regions that don’t have easy cultural access to the holy text or priest class that reads it, etc. Why not this instead?