Past caring for religion? (8,7)

I believe the answer is:

ancestor worship

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

'past caring' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'for religion?' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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