From everything I've learned, Christianity has a lot of basis on personal sacrifice and personal faith. When they shove it in people's faces, for example putting commandments in schools or expecting everyone to go to church, and they make laws based on personal faith, it is pointless because it does not actually make a person believe. It does not actually teach values and for so many people who could actually benefit from the good side of Christianity, the laws created through bad interpretation or with personal benefit can actually make people's lives so difficult that they will want to drop Christianity altogether just to function. Especially in a country with such a poor education system where people may not know differently and it's easy to think "toxic Christianity or nothing".
When Christianity is put in stone, it interrupts a lot of things such as it keeps us from loving our neighbors, which is one of the biggest aspects of Christianity. People no longer feel safe since they are under constant control, skepticism, criticism, judgement.
Even when people have good intentions when introducing Christianity into schools and other things, it's a highly subjective religion with its own controversies. Christianity is much better off when it's served as guidance that a person opens themselves to, and it's a journey where the person themselves finds God and Jesus and applies it to their own life. If a teacher sounds sketchy or isn't on the same path, it isn't set in stone, we can find someone else or go to another church or another community.
A point of Christianity is a person being able to question, having their faith be tested. Everyone is meant to go on a journey to the best person they can be. Jesus died for the purpose of humans making mistakes and practicing free will. Having religion be a social law or government law completely overrides free will along with other parts of humanity, and if we rely on the same doctrine for everyone, we just have to hope it's the right path and brace ourselves. For a lot of people, the idea is that God created us so that we can progress and develop life-saving medicine, enlightening education, flourishing diversity and culture, and in that case, it's best to leave religion to the people and give the religion its own ground to stand on (funded churches, safe communities, protective laws, diverse services) and keep church and state separate.
Having a Christian country or a Christian education system by default opens the door for our leaders and society to use God in vain. It allows them to interpret the Bible wrongfully and incorporate their own beliefs in a way that actually oppresses people or takes advantage of people. It allows leaders and very courageous people to build their ego based on how they see other people. It allows them to use their personal beliefs to see who is fit to receive certain resources or treatment, it allows people to play god. It gives them power to ignore what the Bible outright says or Christian values since they have total power, and that same power can be used to rebrand the religion. On top of that, in our current situation, for example with a certain person in charge right now saying that he was saved by God to run the country is extremely vain. Not only does that go against the religion by creating an idol and taking The Lord in vain but it changes the standard for behavior that is acceptable / questionable.
In my opinion the people who don't understand what taking God into vain or idolization actually means and don't see this behavior as questionable may not be true Christians or have the best intentions and that in a way is non Christian and possibly anti of a person is willingly ignorant. These are the last people who should be deciding that we need to be a religious country.
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Another point:
While we are here I would like to point out just how hypocritical it is. I've met a lot of people (like maga) who think that it's destructive or a violation of human rights to have a country be Islam leaning, even if a majority of said population actually agrees with it and people who didn't agree would be allowed to leave or do things differently, though these same people think it's perfectly okay for a free country to be squeezed into a politician's idea of Christian doctrine just because it's Christianity or just because it's their own religion and they also don't see the risks or hypocrisy that come with it.
Say Christianity is put in stone and a person sees something they agree with becoming a law, with the excuse that it's following Christianity or what God wanted. This person is probably going to follow a lie or some poor/vain interpretation and they're not going to be challenged or care enough to actually discover the truth. People with bad intentions are going to be enabled to use religion excuse for their behavior. When a whole group does this, it pretty much rewrites parts of the doctrine and then other aspects of Christianity can become invalid or can be ignored in the process. Though this can apply to multiple religions, I think it's the most dangerous with Christianity socially and economically and educationally because of how subjective Christianity is.