I imagine it something like this:
God: i'm gonna create a universe.
Helper: ok, sounds great. let's do it.
(POOF)
God: i'm gonna create sentient beings
Helper: ok, sounds great. let's do it.
(POOF)
God: I'm going to communicate with them and give my Word to them.
Helper: ok, sounds great, I will put some giant flaming symbols in the sky... or do you want to just hard-wire it into their DNA?
God: Neither, I'm going to give them a book.
Helper: um... okay. Are they all going to be born knowing how to read it? are the books going to magically appear to everybody everywhere?
God: no, I'm going to just give my Word to this group here. The book will just be for the people who can read that language.
Helper: um... wouldn't it be better to just give some universal PA system thing to everybody all at once?
God: No, just a book and just to this one group.
Helper: umm... why?
God: because I love these beings, but this one group more than any other. the book that I give them says so.
Helper: um... okaay.
etc.