You could be the really sanctimonious person here. Is it important for you to believe you're some exception to the rule, because you fancy yourself to be reasonable or logical on your own terms? Inventing systems of belief which might be called ridiculous or self-serving, "sanctimonious", or judgmental of others didn't end when folks the first folks begain not believing other people's religions.
You take your place in the panopoly of hate when you're so touchy you take it so personally that others think they're "right" in what they believe that you just have to roll out invective like this. A system of belief that can sustain our own self-esteem or feeling of self-worth when you realize you're not appreciated or supported very well by some others is useful. Some call it essential to being a "grown-up". It means you really don't just have to blow off when you realize others are smugly believing they're better than you are, which is in fact generally what "others" always do. They have whatever they believe, and they think their belief makes them "better" somehow. Of course if they didn't, they'd be changing it right now. . . So if they think they know what your belief is, they'll imagine theirs is better somehow, or quickly re-inventing that fantasy right now.
You should go get yourself some Ambrose Bierce quotes to improve your sense of humor. What I said is descriptive of Christian belief based on the teaching of Jesus. He was not even the first to use this kind of self-conscious tautological "judgment". And of course, almost any other human belief system will find support in the psyche as adherents progressively act out their belief. It's human nature to justify our actions and become mentally invested in believing we do good.
Belief, or disbelief, will tend to follow what we choose to do, leaving others who don't do or "believe" as we do, despised or judged in our wake. . . .
The other, or opposite trend, sometimes called "repentance" in religious terms, or adopting a new ideal of reality in secular terms, takes effort, deliberate effort, after recognisiing something we don't like about what we're doing.
Now, having obviously outdone even myself in this kind of sanctimonious acrimony about all other humans, I think I'll repent and just be a humble unquestioning believer in Jesus and specialize in contructing some kind of frame of mind where I can unconditionally love others, or imagine I do. . . . even you. . . . or at least laugh at myself. But the really sad thing is, I just don't see any way people can really escape being this way. It's the way we are.
Even Ambrose Bierce didn't escape from himself, although it's rumored he tried to, with elaborate efforts. And, seeing that, I long ago grew up and realized how useful it is to fortify our belief/faith with devout christian principles such as realizing that "faith" really isn't supposed to be used as a weopon of self-righteous hypocrisy. Admittedly, this is an advanced concept most "christians" don't pick up on real quick, and in fact a failing that has cost millions of unbelievers their lives. And man, sometimes I wish secular humanists or atheists had an element like that in their creeds. Could have saved millions of believers their lives in the past one hundred years.
*anticipating tldr response from GVC