Arabs during theology class convert to Catholicism (8)

I believe the answer is:

romanise

I'm a little stuck... Click here to teach me more about this clue!

'class convert to catholicism' is the definition.
I can't judge whether this definition defines the answer.

'arabs during theology' is the wordplay.
'arabs' becomes 'omanis' (Omani is an example).
'during' indicates putting letters inside.
'theology' becomes 're' (I can't explain this - if you can you should believe this answer much more).
'omanis' put within 're' is 'ROMANISE'.

Can you help me to learn more?

(Another definition for romanise that I've seen is " Make Catholic".)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.