I will see to tone them down in the next version. If they are really annoying you can use
this event file, it disables them.
I will also see whether the prophet event needs some tweaking to prevent double prophets. They already get a flag which prevents them from becoming another prophet, but I suspect that he branched in the event chain and followed two religion braches at once.
Edit: Can you mention which religions are founded? That may provide insight to where the fault lies.
Edit2: just noticed I skipped your intermittent question. The decisions for reform are in-game, but may not work, as I implemented them all but haven't tested them yet. Main reason is that I know without testing that it's not complete yet. What you mention about not having the holy region is the second holy site requirement. Essentially the decision for reformation requires you to have a norse holy site AND another holy site which does not have the norse holy site. This is a somewhat crude way of attempting to stay with the vanilla mechanic (needing to capture holy sites). I will make a custom tooltip if the game keeps this confusing description for the requirements.
In short; You can try to reform, but I doubt that the current reformation is very useful if the decision actually works.