Faithless? Don't you believe it! (6)

I believe the answer is:

untrue

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'faithless?' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

(Other definitions for untrue that I've seen before include "Not in accordance with fact" , "Wrong" , "like the magnetic north?" , "Incorrect or false" , "Not accurate or veracious" .)

I've seen this clue in the Evening Standard.

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