I'd be OK with it if was at a much later stage (year 7 at the earliest), and if all major religions were covered (and the course would have to be *extremely* well monitored to make sure that there is as little bias as possible). In fact it could be simply used to understand our culture, there is no doubt that religious texts haven't impacted the world, there are merits to understanding that. However, just covering the Bible, or teaching at a younger age, or both, (without parents permission, I'll note that sending a child to a private religious school would probably count as permission) is simply indoctrination, something that no government should support.