[Kizzy]

I'd say as per religion and culture are being intertwined. maybe child brides are culturally the norm in certain cultures, but is it written religious text?...

This is where multiculturalism falls a bit flat, as has been said we had in the past these issues and socially reformed to protect children which is why it is such an unacceptable clash to see cultures who haven't quite accepted this.
It should NEVER be seen as acceptable here.

I have no issue with religious observance, however cultures and laws that counter our rights, laws and protections no.