Sort of a complicated question, I'll try to ask. How was I born me and not another?

[EruptedCarcassBloat]

No, it makes just as much sense. And to add to the question, I want to know why I was born at all, and my molecules aren't just a rock on the beach or something.

I thought we'd already established that your parents had something to do with that?  Many parents do end up asking themselves that very same question in another form;

"Why did we have to have a kid, we could have bought a pet rock, and we'd be sitting on the beach sipping fruity ass drinks right now!"

Okay, it just came to me that I could ask the question a little bit simpler.

What are the chances of me actually being born?

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So...are you asking for an explanation of the origin of consciousness on an online atheist forum?  It's one of the most complicated issues that exists, and tons of neuroscientists and other experts are currently investigating it with the best technology we have, and they're still working to come to some sort of conclusion.  If you're looking for a "deeply informative and mind expanding" explanation..not sure what you're doing on an online forum.

And yes, the molecules in our bodies clearly came from things or beings that existed before us, but those molecules were never "us" before their configuration into their current state of "us".

I think the molecules that you shed as dead skin cells are you as much you, or not you, as the molecules which were destined to become a part of you before you were born, from the beginning of time. What I want to know is what are the chances of me actually being assembled by those molecules, what are the actual chances of me being born?