Love the roleplay so far, everyone's adding such fun plot points! I do have a question: are angels and demons being on Earth public knowledge, or is it something most humans are unaware of?
Since we're working off of a realistic take per the Game Master, it's safe to assume angels and demons exist for people of any Christian denomination, Islamic faithfuls, and Judaic faithfuls. There's also be a spectrum to those believers as a group. E.g. people who believe in direct interventions from angels with flesh (as depicted in the Old Testament), people who believe those possession stories (Lott and Israel specifically) are not literal b/c angels & demons lack physical bodies. In this take too, demons and the Devil would pose themselves as other Gods such as Thor in order to have their will be done however necessary...like a psyops where demons pretend to be Gods while bestowing gainful fake-blessings to make it more difficult for people to convert to faithfulness of One God and any of its interpretations.
They could also cause problems inside of the faiths which follow Yaweh similarly in order to make it difficult to discern if Christianity flavors, Islamic flavors, or Judaic flavors are the right way. Signs and wonders, in Catholicism, are said to be possible by God and by Satan.
There's a lot of wiggle room for fun.