The [[Soviet Union]], communist China and the [[decline of the secular left]] in the world, demonstrate that [[state atheism]] and/or [[atheist indoctrination]] through social institutions is vulnerable to disruption and that desecularization can occur rapidly (see also: [[Collapse of atheism in the former Soviet Union]] and [[Growth of Christianity in China]] and [[Decline of the secular left]]).
In China, [[Christianity]] is experiencing explosive growth.<ref>[https://www.theatlantic.com/international/archive/2017/04/china-unregistered-churches-driving-religious-revolution/521544/ In China, Unregistered Churches Are Driving a Religious Revolution], The Atlantic, 2017.</ref> In addition, irreligiousIrreligious/secular countries are vulnerable to rapid desecularization through mass immigration of religious immigration or the disruption of atheistic indoctrination. For example, secular Europe is presently having a migrant crisis and these migrants come from religious countries (see: [[European migrant crisis]]). In [[Turkey]], which has history of a secular state, the higher fertility rate of religious/fundamentalist Muslims eventually caused the banning of the [[evolution|theory of evolution]] from secondary schools.<ref>[Turkey Coup: Undone by Demographics Turkey Coup: Undone by Demographics], The Unz Review: An Alternative Media Selection, 2016</ref><ref>[https://www.nytimes.com/2017/06/23/world/europe/turkey-evolution-high-school-curriculum.html urkey Drops Evolution From Curriculum, Angering Secularists], New York Times, 2017</ref> See also: [[Atheist indoctrination]] and [[Evolutionary indoctrination]]
Current trends, which are covered below, suggests that the [[growth of global desecularization]] may accelerate sometime in the 21st century - particularly in the latter half of the 21st century.