First person's religious ideas are little more than folklore (9)

I believe the answer is:

mythology

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'folklore' is the definition.
(I know that mythology is a type of folklore)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mythology that I've seen before include "Legends and sagas, in general" , "Study of ancient tales of gods and heroes" , "Body of old fables" , "Legend" .)

I've seen this clue in the Sydney Morning Herald.

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