I don't think as humans we've ever been stagnant. Using our logic helps us to keep from being stagnant. However, there will always be a difference between my logic and yours (not you directly).

My logic tells me that this world is too complex, too right for us to live in, etc. that it's almost impossible for this all to come together by CHANCE. This gives my life no meaning, no purpose. I just so happen to come about and be alive. I can try to fill my life with meaning (work, family, friends, etc.), but would still feel empty because I just got lucky. There's nothing special about me cause I could have been skipped in this evolution game.

With God, I have a purpose, I have value, I have meaning, etc. He fills that void that can't be filled by friends and family, big houses, fast cars, women, etc. Instead of accidentally being here, I'm here because he wants me here.

I can go on but I've gotta start working.