Hi Danjs,
A big Aussie welcome to Susan's family. It's good of you to drop in and say "Hi". Hope you like it here, and you stay for a while.
There is a mountain of information, resources and friendship waiting for you here, you just need to jump in start talking and ask any question you like. You're quite safe here and we are very accepting.
As it appears you are currently under your parents provision (food, board, education etc) to some degree there needs to be a mutual respect for each others integrity and feelings. This, clearly isn't happening in your case. Further to that point, as your parents pro port to be christian if not catholic, unconditional love should be one of the basis tenants they should not only teach, but demonstrate through their family.
Is there a relative you could speak to about this and have them approach your parents, if you are not comfortable about doing it yourself? Obviously you are becoming more upset as time goes on, however respect and understanding is a vital ingredient in any discussion.
On a side note. I don't know how far the news of a Royal Commission on child abuse in Australian christian institutions has reached around the world. But if your parents are catholic, they should be worried about the implications this will have in years to come. Catholicism in Australia is just about to be blown apart.
Looking forward to hearing more of your story in time to come, but in the meantime, be safe, well and happy.
Lotsa huggs
Catherine