I think it's fine to say Christianity is bad, I just think doing so in a fashion that is that dismissive in a thread about "weird christian sectarianism on the left" that talks about bad analysis is maybe not the place to do it if you aren't going to give any reasoning. That said, I didn't intentionally call you out and I apologize for that.
I guess I can't say for sure, but I think if you had a list of examples it would have been fine. I'm not religious myself, if that's your impression I just found the thread ironic giving the OP's statement and the initial comment rush.