Reddit reviews The Cunning Man's Handbook: The Practice of English Folk Magic 1550-1900
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There's historical precedent.
Look up the British tradition of 'Cunning Folk'.
If you're not familiar with the concept, they were white magic/folk magic practitioners with strong Christian beliefs. They were accepted by the common folk of the British isles and tolerated by clergy for centuries. There's a few books floating around on Amazon and other websites that might give you some inspiration for a practice centred around Christian ideas of divinity. Here's one I liked, available on Kindle unlimited if you have it.
Bear in mind that they were Christian but not Catholic - the Vatican has traditionally had a hate-boner for magic since before English was a language.