What date do you estimate atheism will overtake theism in the world population

[Anomalocaris]

In Europe?  In the Far East?  In North America?  Or World-Wide?
Certain places are embracing the change more quickly than others.  These places (like Scandinavia) have higher standards of living:  better education, health care, better work environments.  Places that still struggle with poverty are more religious.

I can hope that most of America will be atheist by . . . oh . . . 2040.  It's possible.  But there will be pockets of believers, and all sorts of alternative woo popping up everywhere.

I think America will increasingly segregate into areas of atheist majority in more productive, educated, wealthier and more highly cosmopolitan areas on the coasts, and more religious hinterland dominated by those who can't and won't improve themselves, but who nonetheless feel entitled for heritage, racial and ethnic reasons, and resent those who could usurp them through skill, flexibility and merit.

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In the course of 7 years atheism has doubled from 1.6 to 3.1 in the U.S. That's an impressive change.
http://www.pewresearch.org/fact-tank/201...-atheists/
The article covers some of the other issues with defining athiest and the misuse of the term in general.

On the world scene we see much the same.
http://news.nationalgeographic.com/2016/...-religion/
The article goes into some of the roadblocks to a wider acceptance of atheism.

What is encouraging is not necessarily suitable for linear extrapolation.