Well there are five traditions of magic:
The Merlinites they are the official order the kingdom supports openly.
[good, forbidden to deal with dark powers]
[think grey jedi, dabble in some magics that are not good]
Witches/Warlocks of the Black Saint
[she is neutral, the One Church considers here worship a heresy - open to all kinds of magic it
also has a clergy and some few mages]
Mages of the Old Way
[pagan mages and elven magical users, fae mages and the like - officially not heresy and in
general on decent terms consider her kind of like a Merlinite for attitudes of the massess that
follow the old ways - there are witches/warlocks and clergy]
Followers of the Dark Ones
[evil, dark mages and witches/warlocks basically worship demons and devils and well generally
the ones no one supports except the Black Saint who is neutral to them]
The One Church: Worships the One and is like the Roman Catholic faith is more patriarchial and the official church of the nobles who tend to enforce the overall worship by simply making a follower "beneficial" to the commoner. But has most of the schools, alms houses, hospitals and orphanages. Around 60% worshipped not including those also in the Black Saints following.
The Black Saint: Actually worships the One and the Black Saint is his wife, that is the heresy part and tends to have a decent following if underground. Is considered a get out of jail free card to the afterlife being ruler of her own elysium for the faithful. Around 15% of the humans worship her but this is usually hidden in The One Church save for a few churches and covens in remote areas.
The Old Ways: Pagan gods and goddesses, spirits and the fae powers tends to be worhipped by 20% or so of humans and all non-humans fall into this unless they converted to the One Faith. As a rule considered harmless by the One Church and since they have some influence in the Court and hold land serving the King they are fairly secure.
The Followers of the Dark Ones: Underground cult still has a good following since persecuting them is not easy perhaps up to 5%, tend to be the fast path to magic and prone to various evil deeds. Worshipped by monsters and evil races.