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Originally Posted by tonmoy.dhaka
Also Space-time is a single entity, neither space nor time existed before t=0.
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a) This is the same as the religious argument of "God is the creator of the Universe, nothing existed before God". The difference is that data suggests (but can't prove) that the Big Bang happened. On the other hand there is no data to suggest that God exists. But the t = 0 argument by both atheists/agnostics is the same as the devout.
b) We don't know anything about what happened at t = 0 because the laws of physics don't exist at that time. Therefore we don't know what happens at t = 0, much less "before" that time.
c) Personally I find the concept of space-time not existing at t = 0 to be inherently non-sensical and self-contradictory. If space is = 0, matter could not exist, because matter takes up space. So that means the Big Bang created matter (violation of the 1st law of thermodynamics...although the laws of physics don't apply at t = 0). Ie the Big Bang = God. And since there is evidence of the Big Bang, there would then be evidence of God. Evidence, but not proof, of course.
d) Some have theorized that the Universe eternally expands and contracts ad infinitum (provided enough dark matter exists)...Big Bang, Big Crunch, another Big Bang, another Big Crunch...etc etc etc. But now its kind of a issue of semantics, we can just call all of the various incarnations of the universe as one super big eternal Universe. Regardless, you just rest with this idea of something just eternally existing.
So as Mufti Abu Layth says, the concept of God is not inherently irrational because we already know of one thing that is apparently eternal and not uncreated: the Universe itself. Its just a matter of blind faith, with no data to back it.