Can i Use Only one theme like the Rain only? i dont know what shrine means im from a different country sorry

I'm not reiligiuous but shrines are for worshipping

The main theme is based on an idiom in English: "rain or shine".

"Rain or shine" is used when a person wants to say that they plan to execute an action regardless of any potential difficulties they might encounter.
So "Rain or shrine" is a play on words (a pun).