The problem with maps like these is they fall apart when they hit Asia.
The concept of having “a religion” only exists for the monotheistic faiths.
Across Asia every society has a complex mix of Buddhist philosophy, polytheistic gods, nature spirits, and national ideology.
That being said, one harbinger of civilizational collapse is loss of belief in the religions that made the civilization possible. For us it is Christianity and to a smaller extent Judaism (nice to see Latin America is largely Christian, time to revive my Spanish). India has stuck to its Hindu roots. Same for Israel and Judaism.
Ok now look at China, the most athiestic country on the face of the planet. Does turning your back on Buddhism and Taoism sound like the road to prosperity? Does believing in Xi Jinping and his orbit of international billionaires sound like a good replacement for traditional values?
Could the Mayan god-emporers make the rains fall if enough hearts were sacrificed? No. Time will tell if the “elites” in China and the West can do what the Mayan god-rulers could not. If they can it will be a first in world history.