so who knows truly whence it has arisen?
Whence all creation had its origin,
he, whether he fashioned it or whether he did not,
he, who surveys it all from highest heaven,
he knows - or maybe even he does not know.

The predominant theory of the origin of the universe is the Big Bang.

Tune your television to any channel it doesn't receive and about 1 percent of the dancing static you see is accounted for by this ancient remnant of the Big Bang. The next time you complain that there is nothing on, remember that you can always watch the birth of the universe.

On the big Bang theory: For every one billion particles of antimatter there were one billion and one particles of matter. And when the mutual annihilation was complete, one billionth remained - and that's our present universe.

The role played by time at the beginning of the universe is, I believe, the final key to removing the need for a Grand Designer, and revealing how the universe created itself. … Time itself must come to a stop. You can’t get to a time before the big bang, because there was no time before the big bang. We have finally found something that does not have a cause because there was no time for a cause to exist in. For me this means there is no possibility of a creator because there is no time for a creator to have existed. Since time itself began at the moment of the Big Bang, it was an event that could not have been caused or created by anyone or anything. … So when people ask me if a god created the universe, I tell them the question itself makes no sense. Time didn’t exist before the Big Bang, so there is no time for God to make the universe in. It’s like asking for directions to the edge of the Earth. The Earth is a sphere. It does not have an edge, so looking for it is a futile exercise.

Current theories on the creation of the Universe state that, if it were created at all and didn't just start, as it were, unofficially, it came to being between ten and twenty thousand million years ago. By the same token the earth itself is generally supposed to be about four and a half thousand million years old.

These dates are incorrect.

Medieval Jewish scholars put the date of the Creation at 3760BC. Greek Orthodox theologians put Creation as far back as 5508BC.

These suggestions are also incorrect.

Archbishop James Usher (1580-1656) published Annales Veteris et Novi Testamenti in 1654, which suggested that the Heaven and the Earth were created in 4004BC. One of his aides took the calculation further, and was able to announce triumphantly that the Earth was created on Sunday the 21st of October, 4004BC, at exactly 9.00 a.m., because God liked to get work done early in the morning while he was feeling fresh.

This too was incorrect. By almost a quarter of an hour.

The whole business with the fossilized dinosaur skeletons was a joke the paleontologists haven't seen yet.