I'm not sure Dominion is a great choice if the OP is trying to avoid anything occult-related. Isn't the Witch a card in the base set?
OP, I would just go on BoardGameGeek and browse through the top-rated games. Just looking at a game's page should be enough to tell you if the content is acceptable.
Though honestly, as a newbie, you should probably look through one of the curated game lists: the bare rating that a game has seldom lines up with what a beginner might be looking for. For a start, it's mostly heavier games that have very high ratings.
And like many ratings sites BGG ends up weighted to novelty. Is this really the best movie / novel / video game / comic book / burger ? No, probably not, but it's the popular new one right now among people who watched a lot of movies, read a lot of novels, played a lot of video games, read a lot of comic books or ate a lot of burgers as appropriate.
Unlike built-in ratings (e.g. Uber, eBay) these ratings do at least provide some value at the low end. There are a fair few games on BGG with 5.0 or lower ratings and you probably just don't want those games, sight unseen.
OP, I would just go on BoardGameGeek and browse through the top-rated games. Just looking at a game's page should be enough to tell you if the content is acceptable.