And you want the government to tell you what kind of culture you're to have? You think there's any way that happens that turns out good? If you're worried about too many Americans not being Christians, or whatever, then you just have to try to persuade them to become Christians. Getting the government to tell them they have to be won't help you in any culture war.
I don't understand this whole line of argument. If there were no prevailing culture, there would still be some kind of government, whatever it would be, whether anarchy, utopia, or anything else. It can't be the case that the multiplicities of cultures will make the government just disappear. There are lots of cultures in India, but India still has a government. It's not like you can divide up the world into governments and then divide it up into cultures and say the two ways of dividing it end up with all the same groups.