But there is no quantum world without out a universe.
And, apparently, vice versa.
But that is irrelevant to this discussion. The quantum realm, and hence the universe at the most fundamental level, is not causal. So to ask for causes is to make assumptions that are known to be false.
Fiction now runs rampant with the evolution and billions of years crowd.
First you bring up universe and quantum physics...
Then you switch to Evolution.
Evolution is biology, and have nothing to do with the rest of the Universe and the Big Bang models.
You're moving the goalpost, back and forth, with...
A finely tuned and ordered universe with orderly physics laws must have popped into existence out of nowhere and no cause and effect needs to be explaindeed.
What is the cause for the Big Bang?
As
@Polymath257 have already explained to you, if you going to bring up the quantum world into the Big Bang cosmology, then there are no cause.
If you have studied quantum physics, you would know that the quantum realm are not deterministic, and speaking of causality, have only demonstrated that you don't understand quantum physics.
Beside that, the Big Bang doesn't say anything about the universe popping from nothingness, as there are no such thing as nothingness.
The Big Bang does mention "singularity", and the singularity isn't "nothing". The singularity is the "state" that the Universe is in...the "state" in which physicists don't quite fully understand, yet.
And finally, according to the last measurements by both WMAP and Planck missions, the Observable Universe is about 13.787 billion years old. So the universe took a long time to reach the present state. There are nothing wrong with relying on the best estimates, so far.
"God did it" is even more ridiculously impossible, if you seriously believe that God created the Universe only 6000 years ago.
Plus. You talk of "nothing". Isn't God creating the Universe from nothing? Sun, moon and stars just popping from nothing? The Earth popping into existence from nothing? Talk about straw man and double standard.