True, Congress shall not prohibit the free exercise thereof, AND what is not delegated to the federal shall go to the state .
But
In THIS case, can states determine for themselves that Christmas is a religious holiday and is somehow un Constitutional ?
well the state must obey the constitution- they can’t for instance declare Christianity or any religion against the law- they also can’t determine that religious holidays are illegal- unless they violate someone’s rights (Lets suppose a ‘religion’s’ practice is to steal other people’s property’- this is clearly a violation of people’s rights- so this ‘religion’s’ illegal practice would be be banned, and rightfully so)
I don’t believe a state can prohibit the free exercise of a religion UNLESS as stated above, it violates people’s actual rights (Note- offending someone is not illegal- people don’;t have a right to demand a religion or religious ceremony be made illegal simply because they are offended- only when it violates an actual right do they have the right to ask a government to ban it)
I think the key is does it violate an actual right? For instance, does Christmas force a person to convert under penalty of the law if they don’t? The answer of course is no it doesn’t- Simply because it might offend some folks doesn’t mean it’s unconstitutional