Yes. But I know the wink-wink nudge-nudge aspect of Christianity is even more prevalent in Europe. Many European Christians regard the fables of the Bible as really useful metaphors, not to be considered literally true, the way virtually all of the Hindus you meet outside of India feel about the fables of their religion. They don't really believe in a big blue elephant!
Since the Religious Redneck Retard Revival began around 1980, there has certainly been an upsurge in literal religionism in the USA, which dovetails nicely with my people's proud scientific ignorance and their generally abysmal education in all subjects. But still there are lots of Americans who think the Ten Commandments and Jesus's teachings and all that stuff are nice guides to a good life, without actually believing in the tablets of stone or the Resurrection.
Never forget that the two most prominent symbols of Christianity in the United States are Santa Claus and the Easter Bunny.
But to get back to your original question, as to why religionists should be allowed to teach this ridiculous crap to impressionable young children: freedom of religion is enshrined in our Constitution. As a nation we made the decision that religion is a special kind of belief system, not subject to the same rules as racism, anarchism, pyromania or enthusiasm for dog fighting. It is actually the Law of the Land that everyone is free to teach their children the most preposterous explanations for why the universe is the way it is. (Although personally I think we went way too far when we exempted churches from paying taxes.)
The reason that even loudmouth atheists like me patriotically respect Freedom of Religion is that
no matter how awful religion is, banning it always turns out to be worse. History is full of accounts of religions being treated with hostility and they always end badly. You're probably young enough that the Holocaust is just a chapter in your history book, but it happened
during my lifetime. I'd rather live in the United States and put up with the Religious Redneck Retards, than live in one of those places. How many of us atheists are here today, because our grandparents or great-grandparents came here in search of religious freedom?