Commonly believe biblical characters (4,3,3)

I believe the answer is:

adam and eve

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'commonly believe' is the definition.
'adam and eve' can be an answer for 'believe' (I've seen this before). I am unsure of the 'commonly' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for adam and eve that I've seen before include "early marriage?" , "First people" , "Have confidence in" , "to have faith in cockney" , "people eating fruit" .)

I've seen this clue in The Daily Express.

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