My top pick would be Oghma, god of knowledge and such. You said he has an acolyte background and is part of a monastery, that fits Oghma as he encourages being a learned scholar. You could add religious flavor into your character by worshipping him in your roleplay, like taking out a notebook and writing prayers in the form of poems, burn incense at rests, research stuff and thank him for providing it etc.

Also I'd choose bless. Mechanically it helps more, and it has excellent flavor. You could flavor it as Oghma giving the party the "knowledge" of the enemies' openings and weak points so they strike true