At public schools in NSW religious practices are confined to consensual events: 'scripture' classes, for instance, or special Easter and Christmas events, but they are announced so die hard objectors can absent themselves.
It doesn't apply, though, to aboriginal religion. Children are exposed to it (dreamtime, spirits, multiple creating beings) without notice.
This tells me a couple of things: Christian parents either don't care or don't know, the schools don't really truly take aboriginal culture seriously; they just think its a nice but irrelevant set of cute 'native' beliefs; not something that should affect life, or they really want to play with our children's spirituality. Unlikely!
We should take it seriously and either believe it, or object to it. I vote for "object".