The truth of the religion would depend on the one who made the universe in which one lives. We can imagine any number of universes and their accompanying truths–sci-fi stories are replete with these.
I can’t see the advantage of this exercise for finite creatures, though. I may be fun, but it cannot change the reality in which we live. I often think sci-fi writers are attempting to negate reality in order to create their own religion, which is fun to read, but then one has to come back to the way things really are and deal with that, anyway.
Any god figure is going to “make the rules” in any such scenario whether the god figure is a mortal being or a supernatural one. As humans we cannot escape the natural law of God no matter how hard we might try or might deny its existence. As I see it, it’s an exercise in futility.
I would have God just as he is. You may think that’s due to a lack of imagination, but be assured it isn’t. I have a very wild imagination in which I can create all sorts of scenarios, but in the end, truth must out. And the truth is, any God worth his salt would be one who need not explain himself to those he created, need not do anything about their lives if he chose not to, but who is bound by his own justice, love and mercy to get involved anyway. Otherwise, why have a God at all?
PS: It is against forum rules to start two threads on the same topic, so this one will have to do.