Sounds like a bit of a toss up from this guy!
While the Catholic Church did have a bit to do with Aboriginal children they did not rmove them from their parents but rather took care of them after the government took them away. Anglican and other Protestant denominations probably had more to do with these children that the Catholic Church.
I think the Chruches as a whole get a bad rap for this although it is what tends to happen when the church and state are a little bit too pally. In my own state the Government of the time tended to be full of Anglicans and Methodists.
Mel