This just screams parasitic impostor, not a “god”. IMO, this “heaven” is just an astral location people think they should be in, so they are, without realising there are thousands of other options.
You don’t have only “heaven” or this guy’s say-so as your only choices.
I suggest banishing it and trying to find the actual god that isn’t an impostor looking to drink your milkshake. Fix the holes in your spiritual hygiene so that things like this can’t get in to trick you.