It's more complex than that. For one thing the current porn industry does have some ethical issues. Even people not opposed to pornography per se have issues. But beyond that, the zealously anti-porn crowd isn't just Christians. It's something of an unholy alliance -- you have more than a few ultra-woke, a smattering of the Q crowd type, and of course the good ol' fashioned core of Catholic and Baptist types. Plus no doubt some others.
I love that every time Christianity is brought up on HN someone throws out the Q crowd. I have chatted with a number of Q people and they were not Christians and non of them were for restricting porn, that is out of their 'scope'.
Q on your side is the antifa of the other side, just a name for an nondescript group you disagree with.
I did not think they were. I do think the Q types are a moral-religious movement, or moral reference framework, of some kind in many ways. Perhaps sucked up by the void caused by the decline of mainstream Christianity in America. Just as the far-left progressive equality crowd (antifa, if you will) can be at times. That's why I made the comparisons.