thedoc wrote:
I am reading this thread to read IC's presentation of the Cosmological Argument.
Then for your sake, I'll move forward again.
To summarize: we have established what we can by logic and maths: namely, that infinite regresses of causal relations cannot exist. If such a chain were infinite, then there would be no initial event to precipitate the rest of the chain. That indispensable event would never have itself taken place; for when we went looking for it we'd simply be lost in the infinite regresses of the causal sequence, and nothing would ever exist.
Meanwhile, entropy gives us another problem, because it's causal, empirically measurable and readily observable. We already know where science tells us it's eventually taking us: to the universal and final condition known as "heat death," with the universe in an eternal condition of equal distribution of mass and energy, with no possibility of any future reactions between any particles. And if we paired this verifiable, measurable observation with the hypothesis that the universe is already infinitely old, then it would dictate that the universe would right now be in heat death,

and that it would have already been so for an infinite period of time.
But this is clearly not so, as we can clearly observe. The universe
does exist, and
is not in a state of heat death. So again, we have to be convinced that the universe must have had an initial causal event, at some time in the recent past -- "recent" that is, on the
cosmic scale, not as we mere mortals reckon "recent."
In other words, we now know for certain the universe must have had an
uncaused cause. That is, whatever commenced the chain of causality cannot itself be a member of the chain, because then it would need a prior cause, and infinite regress would ensue -- but we've already established that an infinite regressive chain of causes has no starting point, and so cannot come about. So we have to be looking for an uncaused cause of some kind.
And it doesn't matter a jot if one is a Theist or a Materialist Atheist. If we can do the logic here, then we both know there's just no other option. So we can continue to argue about what the precise nature or identity of that uncaused cause might be, but we cannot any longer argue about its
necessity: we both know that there
has to have been an uncaused cause of some kind.
Stage 2 of the argument is simply this: what are the candidates for an uncaused cause of the universe? We're past wondering if that's what we need; we now
know we do. We just have to start thinking about what an uncaused cause would look like.
We discuss that, then look to stage 3.