So what you're saying is that states can establish a religion (do you happen to have any legal citations on that?) and if you don't like it, the choice is to move? Your proposal seems to be that a state or states can establish that religion, persons of that religion move to that state and persons not of that religion move to a state in which their religion is the state religion, each religion congregating in a designated state. I would assume those who can't find a state in which their religion is a state religion have the option of converting or leaving the country.
Official state religion doesn't mean that no other religion can exist. The precedent, again, is that at least one state had an official state religion when the Constitution was ratified. It was by their own choice that the official designation was later removed.
I, personally, do not want my state to have an official state religion. It is far easier to work locally, within my own state, to ensure that such a thing would not happen. As it is easier to work locally to effect other proposed legislation within my state. That is the design and the intent of the original constitutional model. That the original intent has been so warped over time that it is beyond recognition of even some FReepers is truly sad.