According to Browd's Guide: "most of the reformation beliefs provide 'follower-like' benefits, though some are restricted to the founder only," though it wasn't always clear to me from the guide which ones were follower and which were founder-only. I actually asked that question in a comment a month ago and the guide hasn't been clarified yet, however, he mentions the following as follower-benefitting and potentially dangerous choices as a result, I assumed from the way it was written if he didn't say if was follower-benefitting it wasn't:
Follower-benefitting according to Browd's Reformation War Academy Article:
Jesuit Education
Religious Fervor
Sacred Sites
Too bad for Sacred site strategies, as the AI gets the effect too and can build all your buildings as well and so will accumulate early tourism and culture.
However, given they're ******ed and you'll get the shared religion modifier it still works but with some effort, you probably do NOT want to spread your religion given two religious buildings can drastically accelerate early culture for the AI.
The rest were unmarked meaning they probably go just to you. This makes sense as the others are: benefiting gold to city-states (worthless if neighbors can do it) or affecting prophet/missionary action. It seems to be the trend that missionary/prophet, or person-purchasing faith beliefs are only for the founder. This seems to be the trend, though even if they aren't, who cares. If any AI is making your missionaries you can only benefit. The spy one is probably only your spies from the way it is described. Heathen conversion is unmarked as well and I'm unsure which way it goes as the other military belief is follower. Unity of the prophets is obviously follower as well, it's just all cities of your religion so there's really no distinction.
There's my best guesses. If anyone else has more experience let me know.