Originally Posted by D

I think, as a species, we're too diverse and adaptable to become extinct from most conceivable things.... whether it be asteroids, viruses, or even religion.

I think we'll eventually become extinct the same way that our bloodline has become extinct since the dawn of time - genetic drift.

Only difference between past and present, imho, is maybe this time we'll be directly affecting the drift in our own gene pool (via technology), and hastening the extinction of Homo sapien into the next evolutionary stage.