I just don't really see how it adds to the conversation. Unless we're talking motive, as in his religion somehow motivated him. Other than that I just see comments like daily attendants to Mass are "fanatical", somehow the Priest had a motive in his words which were probably just observations, and speculation on Confession and Sacrement. Again, not trying to be rude at all. And this is just my opinion.
At this point we don't know any motivations. We know he was of a devout Catholic family, he seemed to be getting involved with an anti-homosexuality group(s) according to his social media and from first and second accounts of school friends he was either homosexual or fighting those tendencies.
So I honestly think since there is very little facts except above everything is speculation at this point.
Could his religion motivate him to not only reject his own tendencies but that of others? I think the answer is yes, the Church as many other religions reject homosexuality. So I imagine if one had those tendencies and were told they were wrong by Church and devout family members that yeah that could be a motive. We don't know. It could be and it may not be. This is a sleuthing site so I can see others coming up with those thoughts just as much as any other speculation I guess. Until the facts come out at trial we don't know much other than above.
Your opinion is just a valid as the next persons. I often have different opinions as well and have to agree to disagree many times. I also have to admit when I'm wrong too.
ETA: I don't read this as anti Catholics as many Catholics are on here. I think its a discussion about how religion (any religion) may have an influence on how someone behaves. Discussions go back and forth and that's how we learn about each other.