State sanctioned religion:
The US is one of the few countries to practice, or claim to practice "separation of church and state". Many/most countries do practice, or claim to practice, "freedom of religion", though in these same countries the state sponsors one or more religions as "official".
So how important is separation of church and state, the founders of this country had mixed thoughts on the subject, and even today there is debate about how far this concept should extend. Does the state sanctioning one religion necessarily exclude and discriminate against all others? Is "freedom of religion" ever a reality, even in the US?