Mutually exclusive doomsday cults

Doomsday cultists don't just want any apocalypse. The want the capital-A Apocalypse which validates their respective beliefs.

So, for example, believers in the Austrian Apocalypse tend to dismiss global warming or Peak Oil as Chicken Little stuff. Believers in the Singularity AI Apocalypse dismiss religious apocalypses, like christian "end times" beliefs, as woo. Christians don't believe in the Islamic Apocalypse, even though Jesus plays a role in the latter as a good Muslim and a supporter of Muhammad.

BTW, the garbled version of christian beliefs which shows up in Islam also illustrates christianity's history of mission drift. Arabs who knew of christianity and its failed doomsday prophecy tried to patch it up with the story of Muhammad's later revelation and other arbitrary accretions.

I get the impression that non-Western cultures which have developed independently of christian influence generally don't produce this sort of thinking. When christian beliefs start to infiltrate non-Western societies through trade, conquest and missionizing efforts, however, during times of stress in these societies, apocalyptic beliefs based on adaptations of christian teachings have appeared. Hence the emergence of the American Indians' Ghost Dance, Melanesian cargo cults and the Chinese Taiping Rebellion. Islam probably also belongs on the list as another unintentional product of christian doomsday thinking.

Meanwhile, the preponderance of evidence suggests that humanity will continue to muddle through for an indefinite number of millennia to come, with no metaphysical discontinuity in sight to elevate members of a privileged generation to superheroic status.