Al Jazeera has some good documentaries.
This was one on Residential Schools from a few years ago:
https://www.youtube.com/watch?v=peLd_jtMdrc
And, if you are looking for some additional reasons to not like the Catholic Church, then watch these two on the Irish mother and baby scandal:
https://www.youtube.com/watch?v=F65Mc3oBylk
https://www.youtube.com/watch?v=Zq__aXARjEs