Religious text starts to question unusual rationales about Neo-Christianity (5)

I believe the answer is:

quran

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'religious text' is the definition.
(I know that Quran is a religious text)

'starts to question unusual rationales about neo-christianity' is the wordplay.
'starts to' suggests taking the first letters.
'about neo-christianity' becomes 'an' (this could be a standard abbreviation of which I'm unaware).
The initial letters of 'question unusual rationales' is 'qur'.
'qur'+'an'='QURAN'

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(Another definition for quran that I've seen is " Islamic holy book".)

I've seen this clue in The Times.

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