Sean confused about church's shares or the exact opposite? (10)

I believe the answer is:

antitheses

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'shares or the exact opposite?' is the definition.
I can't tell whether this defines the answer.

'sean confused about church's' is the wordplay.
'confused' indicates an anagram.
'about' is an insertion indicator.
'church's' becomes 'tithes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sean' with letters rearranged gives 'anes'.
'anes' going around 'tithes' is 'ANTITHESES'.

Can you help me to learn more?

(Another definition for antitheses that I've seen is " contrasts".)

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

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