Diesm. I'll tell you why.
What separates you from a rock? Is it your ability to move? Ability to feed? Ability to grow? To reproduce? The answer, scientifically or otherwise, is Life. You are alive. The rock isn't.
Now, what separates you from the rest of the organisms? Your ability to think, to express your ideas. To feel emotion.
I believe this is your Soul. The existence of a soul is something unexplainable by scientific means. Your soul makes all your decisions. It is your originality, your individuality.
Yes, all of our movement and thought is based on electrical signals. But when you say "I love you" to your spouse, or when you're feeling the utmost of rage upon your hated enemies. When you're tasting bitter tears of despair, is it all but a mere electrical signal? An electrical signal sent out by an advanced sentient life form who will ultimately become nothing but dust and shadow?
I was raised Catholic, but don't get me wrong: I am very open minded to science, reason, and logic. I believe in Evolution, and I am open to other theories. I believe in dinosaurs and neanderthals and the like. But when you tell me there is no God, that the cosmos has just...been there for eternity or that there was a random explosion out of nowhere that created the universe? are you serious? Or, that when you die, you become a fertilizer in the dirt while all the memories of your life just...fade over time. Was your life meaningless? Those thoughts are too depressing for me.