'religion' should be kept completely separate from education.
we live in a multicultural society and no one religion (ie christianity) should be incorporated into public schooling. if parent want to, they can send their child to a religious school.
as to teach all religion, i don't think that will every really happen. the teacher will always sway towards their belief system. when they start doing history and geography, different religions and cultures will be taught but religion as a class, no.
my son's music teacher in pre-primary decided to take it upon herself to talk about christianity. my son came home in tears, saying he was not allowed to love me because i didn't believe in 'our saviour jesus christ'....
ffs i hit the roof!!
thankfully my son knows a lot about different religions and experiences them first hand when we travel overseas.