Being a believer, kneels regularly in front of shrine, to show fidelity (12)

'fidelity' is the definition.
(I know that fidelity can be written as faithfulness)

'being a believer kneels regularly in front of shrine' is the wordplay.
'being a believer' becomes 'faithful' (I can't justify this - if you can you should believe this answer much more).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'in front of' says to take the initial letters.
The first letter of 'shrine' is 's'.
The alternating letters of 'kneels' are 'nes'.
'faithful'+'nes'+'s'='FAITHFULNESS'

'to show' is the link.

Can you help me to learn more?