The effect of state sponsored religion on the non-religious is probably similar to what has happened in Europe. But the combination of state support and benefits, together with a high birthrate, is resulting in a gradual takeover of the country by the fundamentalists (which, like all unsustainable trends, can't go on for ever, but it's anybody's guess at what point it will stop). Do you really want to take the risk that the U.S would be more like Europe?