To be clear, the comment denigrates Christians, by (among other things) saying that they pretend to worship.
Once in a while you see a shining example of compassion and generosity born from church activities like this one: https://twitter.com/MorePerfectUS/status/1645867657697153046
That's the true Christian faith at work. Sadly it's the exception.
If you are unwilling to put in the effort to learn what Christianity is, then you should also be unwilling to make comments about whether people are practicing it correctly.
I don’t think people who are raised Christianity are taught what Christianity is, so it doesn’t surprise me that you’re born, raised, & confirmed. People who are born and raised Christian are generally taught how to practice Christianity, and that instruction is tailored to their specific sect. They are not (typically) taught what Christianity is, especially other sects, because it is not really relevant to the practice of Christianity (this is not a judgment, I think it’s fine). I would expect people to learn what Christianity is if they went to seminary (depending, some seminaries don’t) or if they studied religion in college.
It is only through a misconception of religion that the accusation of pretense really stands. “These people aren’t really Christians, they are just pretending” is an old chestnut that has started enough wars; it is long past time to disabuse people of the misunderstandings that lead to those accusations in the first place.
You can see Christians who are behaving the wrong way, by your judgment, without accusing them of acting unfaithfully.
If you sincerely do just want to communicate this to them, I recommend using "God" instead of "Skygod". It doesn't change the message and it makes it sound more like you're speaking in good faith.
>If you don't call out the hypocrites, how would they ever know they are wrong?
If you're not actually trying to convince them they're wrong, you can't use that to justify uncivility.
I get that being polite is less important than preventing someone from leveraging the government to restrict others' freedoms. But if everyone defects from social norms, we'll be in the exact same place on those issues while being collectively worse off.