Not to get too far in the weeds, and I am not very religous, but what our founders meant by freedom of religion was not to protect people from others beliefs as much as it was to protect people from our government keeping them from exercising their religous beliefs.
Mandatory prayer in a public school would violate that, but allowing kids a moment of silence to do whatever they want with it, would not. Although I doubt that is even allowed. A kid wearing a Jesus shirt should also be allowed. A citizen should be allowed to express themselves, even in a school. However I assume nowadays a kid would be forced to remove it. That I disagree with. It's not like a school employee is wearing it or a school forcing kids to wear it.
That's where I feel things have gone too far. Afterall you see stories of teachers pushing agendas, with a religious type fervor, like LGBTQ issues pride month and even political view points. How is that any different than someone pushing a religion? They are both expressing a way of life or a philosophy of how to live your life, etc... They are not education based.
And again not religous, but I don't think it's any coincidence that the rise in school violence, mass shootings, certainly increased massively after we removed religion from schools. Too many kids today have no moral compass, feel there are no consequences for their actions. I don't think that's a coincidence.