States can establish religions. Federal government can’t.
Over the last 150 years, the Supreme Court has pretty consistently found that the Bill of Rights applies to state as well as federal government: https://en.m.wikipedia.org/wiki/Incorporation_of_the_Bill_of_Rights
See especially https://en.m.wikipedia.org/wiki/Everson_v._Board_of_Education:
Everson v. Board of Education … was a landmark decision of the United States Supreme Court that applied the Establishment Clause of the First Amendment to state law.
Mandatory “one nation under god” pledge in school classes disagrees that religion cannot be established.
The pledge isn’t mandatory. By law, it has to be optional. Schools have gotten in trouble over it.
There are so many cases of promoting Christianity by the US government, a few cherrypicked cases of “trouble” doesn’t disprove any of this.
- “As a matter of historical tradition, the words ‘under God’ can no more be expunged from the national consciousness than the words ‘In God We Trust’ from every coin in the land, than the words ‘so help me God’ from every presidential oath since 1789, or than the prayer that has opened every congressional session of legislative business since 1787.” https://en.wikipedia.org/wiki/Pledge_of_Allegiance#Legal_challenges
Also, the US print religious indoctrination on their currency: https://en.wikipedia.org/wiki/In_God_We_Trust
