- If atheism is true, then we evolved solely to survive (premise).
- If we evolved solely to survive, then we would behave such that we avoid things that could kill us (premise).
- We have evolved such that we desire to discover and explore the unknown (premise).
- Exploring the unknown is extremely dangerous and could kill us (premise).
- We follow our desire to discover explore the unknown (premise).
- We do not behave such that we avoid things that kill us (follows from premise 4)
- Therefore, we did not evolve solely to survive (modus tollens from 2 and 6).
- Therefore, atheism is not true (modus tollens from 1 and 7).
I think premise 1 is uncontroversial. 2 I think is not as uncontroversial, but I think if naturalistic evolution is true, then we should see behavior geared for survival. I think that is inexplicable why, in a world where we all our behaviors are tuned so that we survive, that we would be compelled by an urge to discover things and knowingly put our lives in danger for those ends. We climb mountains, go on voyages across the ocean, fly 30,000 feet in the air, leave the earth's atmosphere to explore space and go to the moon. We have this insatiable urge to know things, and people purposely put their lives in jeopardy so that we can learn new things which may be ultimately neutral or detrimental to our survival.