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It isn't evenly distributed and the US doesn't have one culture, plenty of Americans never encounter much religion, particularly in the Western US which is overall less religious.

The groups that take it seriously are more likely to observe Diwali or Ramadan.

The US's First Amendment deals with that, in great part to get away from the (at the time) Church of England and prevent that (mixing church and state) from happening here. It doesn't logically surprise me that the country who left that scenario to worship freely has higher numbers of religious people 300 years later than in the country that still lived under much of the corruption for a longer period of time.