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My first instinct was to say this is a question with a very obvious answer if you look strictly at statistics of self-reported beliefs and church registration, etc. But I will take it in a different direction for the sake of being the devil's advocate:
Europe. The most popular religions being New Atheism and Islam, a small, but fast growing up-and-comer.
Most Americans like to say they are religious, but they are actually some variety of agnostic or nihilist. Much like Europeans were 50 years ago.
In France the few churches still frequented are by old people (70/80 years old) ... In 20 years there will be no more.
There is more than 42 000 churches and their maintenance is expensive so the small churches are sold and then the interior is transformed into habitation or office.
I think that the last believers in France will be those of Muslim origin but in 50 years they will also follow the same path.
North America, for sure.
USA is way more religious than Europe, and Mexico, one of the most religious countries of the world.
Canada not so religious but its population is very smaller.
West Europe has some relatively more spiritual hubs - Portugal, Ireland, Italy, Greece, southern Germany, maybe Austria, maybe Spain, but in general it's very secular. France and Sweden in particular have an enormous share of atheist people.
Since North America includes everything on the mainland from Panama up to Canada in addition to the Caribbean, North America appears to be the obvious answer.
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