One of the marvels of the American experiment was its acknowledgment and tolerance of diverse religions despite Europe's history of religious wars.
(NOT an impediment to public exercise of any religion).
The system has worked pretty well for over 200 years but with success comes complacency and dissent.
Today we have complacency & dissent in both the religious and secular fabric of society...in the face of the cyclic rise of an unenlightened & unreformed Islamic socio/political/pseudo religious society (Not a race) that was devised in opposition to what were then the dominant religious entities across the region.
A system that was & is inherently expansionist and brutal.
Today we are in the grips of complacency/dissent versus the same unreformed & unenlightened movement that Martel fought off two centuries ago.
Those who do not learn from history...
The adage doesn’t account for the desire to repeat (or retry) what history recounts as failure.
Good points regarding complacency.