It's a multiverse but it's also a multiverse full of people running every kind of scam, swindle, and bit of shady political intrigue imaginable. I'm all for the spirit of exploration but also I come from a universe with the Romulans.

It's worth asking questions over.

[It feels like someone claiming the existence of the actual Earth Biblical God could be trying to wield it for the purposes of manipulation more than "I'm a super ancient ancient being."]

[Besides, he'd hazard a guess that while being questioned might feel a little rude, if he's an actual demon he hope he respects the fact he's not just automatically being a naive chump and instantly going with it.]