Cryptic crossword clue
By feeding John I am without sin, backing faith 15

The most common and most likely answer to this crossword clue is the 15 letter word PRESBYTERIANISM

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "faith" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case faith = presbyterianism.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does PRESBYTERIANISM mean?

PRESBYTERIANISM noun
  1. That form of church government which invests presbyters with all spiritual power, and admits no prelates over them; also, the faith and polity of the Presbyterian churches, taken collectively.

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