Crossword Genius

In Zulu, the ranger keeps the faith (8)

Ross

I believe the answer is:

lutheran

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

'the faith' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'in zulu the ranger' is the wordplay.
'in' says the answer is hidden in the clue.
'LUTHERAN' can be found hidden inside 'zulu the ranger'.

'keeps' is the link.

Can you help me to learn more?

(Other definitions for lutheran that I've seen before include "it could be Bach" , "Of the Protestant Reformation" , "Anti-Catholic" , "Bach, for instance" , "Protestant church member" .)

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