Could someone explain to dividie, in simple terms, that Gaza (not Palestine) is not representative of all Muslims, who, in the main despise 'Palestinians' for more than good reason, that its own self-created troubles are not theirs, and that there is zero reason for Islamites to find it difficult to fit in here as a result?

I cannot reason with the boy.

It is clear that Islamites do not want to fit in here - they want to exloit, even steal, and take control here, and thatthey have no real place here and we have no need for them.

Australian governments can't make laws to promote any one religion but NSW is close to doing it.
https://www.nsw.gov.au/community-services/one-mitzvah-for-bondi