Would I criticise this religion? (5)

I believe the answer is:

islam

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'would i criticise this religion?' is the definition.
'Islam' can be an answer for 'religion?' (Islam is a religion). I am not sure about the rest of the definition.

'i criticise this religion?' is the wordplay.
'criticise this religion?' becomes 'slam' (I am not sure about this - if you are sure you should believe this answer much more).
'i'+'slam'='ISLAM'

Can you help me to learn more?

(Other definitions for islam that I've seen before include "Religion based on teachings of Muhammad" , "Religious faith of Muslims" , "Religion of the Koran" , "Koran its scripture" , "Major world religion" .)

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

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