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The statute makes it an offense to carry on the premises of a public OR private school, unless pursuant to a written regulation or written permission of the institution.

It uses the definition of 'premises' that we've all been ingrained with by now, as in the building or portion of the building. Since i don't have a case law to cite where the courts have provided better clarification, I generally tell my students with this type of 'what if' question that if they observe the more restrictive option (ie, don't tread on the school grounds / into the school portion of the church property) then it will help keep them from becoming the test case.

The other option, of course, would be to get written permission from the church's school or having them incorporate a written policy on the matter.

I've also had another version of this question asked; "What if my church service is held at a school auditorium on Sunday's?". I tell them in this scenario that a school is a school, even if rented out to a church, & sticking to the 'more restrictive' rule of thumb would still be valid.