Yeah, here, your rights to religiously indoctrinate your children are protected by our charter of rights. Anti-vax beliefs, on the other hand, certainly wouldn’t fall under that purview.

I know, at least in my country, anti-vax indoctrination does count as clear and present danger, and while you probably wouldn’t outright get full custody, you could potentially get an injunction against anti-vax indoctrination.

Sadly I doubt this is true of the US.