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One of the theories was precisely that- an essentially cyclic universe- the Big Bang followed by the Big Crunch- followed by the Big Bang- and so on. Something to do with String Theory.

Fine, but even if the 'cyclic universe' were to be true, wouldn't you be curious as to how the very beginning of that universe happened, string theory nothwithstanding? But, regardless of what comprises the universe, strings and quarks and time and dimensions , the question still remains: where or how or why did any of that happen?

Let me attempt to intrigue you by this very child-ish thought: Can you fathom the limit of the universe? I mean, can you think of how the end of the universe will look like? Will it be a wall? If then, shouldn't something lie beyond it, be it even more wall? Isn't the very idea of an infinite universe unimanginable by the human mind? I mean, how do you have a volume without a limit? How does t universe stretch forever? What lies at the end of forever? Perhaps more 'forever'?

In other words, I don't know, and no one can really satisfy this question of yours. So to prevent himself from going crazy, man planted the idea of religion.