As opposed to, y'know, just writing the canon of the next 2000 years to make them look like bona fide and legit gods?
Careful with the real-world tie-ins, muthsera.
And remember, Vivic wrote the sermons for his people. Not fiction, but from the mind of a mortal become god who (perhaps by the time of the writings) had become weary of god-hood. They're confession, teaching, reflection, condemnation...the Letters are amazing.