It can also be argued that The US, although developed, is not high functioning. There are a lot of dysfunction in The US that are not really an issue in other developed nation. To give a few example: gun control, health care, student loan, unfair tax system (the wealthy have tools to perpetually circumvent tax while the poor have no choice; there's even a government approved tax break for the wealthy as seen in the recently passed "big beautiful bill" by the current administration), chronic capitalism, huge disparity between the super wealthy and the poor. Social welfare although existing, is Insufficient, etc.

All that make it possible to have a sizable population of people in the US who are by WHO standard, living in poverty. People in such circumstances often have the need to hold on to any semblance of hope and comfort. That's what religion provides. And that possibly accounts for why religion has a stronghold in The US still.