Humanity is capable of ending its own existence, but despite everything that's turned to shit in the world of late, I am still unconvinced that this is still very likely. Humanity can certainly suffer individually and severally but its complete extinction is less certain. Human society and culture are complex systems, and complex systems are inherently resilient in terms of survival if not in terms of thriving.

On the other hand, religion is inherently unsustainable, so despite our several propensities to be taken in by it, I believe religion is apt to continue what it's already doing to itself: marginalizing and diluting itself out of relevance. There will always be a few people in thrall to it, but I think that fundamentalism will become part of the true fringe within the next 3 or 4 generations, and religion generally, within the next millennium. This presupposes, however, that civil society will continue to maintain itself overall, so that people can be fairly far up the hierarchy of needs and continue to be educated overall.

Knowledge and a respect for facts, evidence and scientific endeavor are the death-knell of religion. That is why religion keeps trying to plunge us into a new dark age. If they succeed, then we'll either have a WW2-style detour of human suffering, or possibly (but less likely) a tipping-point scenario where we're set back a thousand years and have to rebuild a lot of society from the ground up. In that latter scenario my predictions would be off. However in the former scenario my predictions would remain basically on-target.