Beware of false knowledge; it is more dangerous than ignorance - George Bernard Shaw
Thoughts on Religion:
I answered this question on Quora the other day. I think it summarizes well.
When will humans die off?
Hard to say. The timing will depend on the cause. I am more inclined to believe humanity will wipe itself off the map before the physics of the universe leads to our demise. We are a self destructive arrogant lot. Hard to imagine all those believers in revelation or some other doom & gloom would put up with being wrong. They would probably put an end to humanity just to prove themselves right.
On the other hand, humanity is capable of great compassion and humility. Gandhi, Jesus, Buddha, Mother Teresa, Martin Luther King and the countless others who have given their lives for others without violence are examples of human compassion.
If humanity doesn't wipe itself out first, I say we got at least 100,000 years or so. Life is pretty resilient. If by some miracle we manage to not get taken out by physical changes to our environment in the next 100,000 years - the probability of meteor strikes goes up with time among other things. The sun will eventually burn out turning into a red giant consuming the earth in about 5 billion years. That should be the end of us.