Hi River! Thanks for reaching out
1. There are explicit references to small and forgotten gods, but if you want to rename those "spirits" or "ghosts" the game functions totally fine. They're more like animist deities than anything else.
2. If the level of themes in the playkit works for you, then you'll be fine with the full game itself. There might be a couple of pieces of artwork that depict gay animals, but that's it.
3. There is no violence in Wanderhome, not even with the vagabond! There is the Veteran, another playbook who has a sword - but they never draw their sword and the act of using it causes them to immediately get removed from the game. Besides that and the Vagabond's history (which they've moved on from) there's no violence of any kind.
Please let me know if you have any more questions!