I think the article linked (together with the OP) is very misleading. The article states:
What exactly is that “membership”? Is it a paying job? Is it helping around the parish? Or is it “excommunication”? (said in the full article - and is actually an echo from an extrapolating lifesitenews blog). We don’t actually know! The article doesn’t state what membership is.
Then, I doesn’t seem that “Calvary Baptist Church in Oshawa” is catholic.
What is interesting is following the article to the original statement:
Well, here we could ask if a person actively cohabiting in a same sex relationship is the best choice to be teaching catechesis (they don’t seem catholic, so I think the term catechesis doesn’t apply.) I would say the parents themselves wouldn’t want the person teaching “Sunday school” preferring instead someone with a different profile in terms of doctrinal positions, and I deem the parents competent to make that choice. Again, in this case the State can’t intervene, because those private associations have freedom to choose who they deem most competent for those tasks.