In fact stuff comes from nothing in the quantum world all the time. And it is where quantum mechanics becomes important that our understanding of the big bang breaks down.
Your list of denials is impressive. I don't have the time or inclination to respond to each one, but I thought I would share some information on this one:
Some physicists assert that quantum mechanics violates the cause/effect principle and can produce something from nothing. For instance, Paul Davies writes:
…spacetime could appear out of nothingness as a result of a quantum transition…Particles can appear out of nowhere without specific causation…Yet the world of quantum mechanics routinely produces something out of nothing.
But this is a gross misapplication of quantum mechanics. Quantum mechanics
never produces something out of nothing. Davies himself admitted on the previous page that his scenario ‘should not be taken too seriously.’
Theories that the universe is a quantum fluctuation must presuppose that there was
something to fluctuate—their ‘quantum vacuum’ is a lot of matter-antimatter potential—not ‘nothing’.
Also, I have plenty of theoretical and practical experience at quantum mechanics (QM) from my doctoral thesis work. For example, Raman spectroscopy is a QM phenomenon, but from the wavenumber and intensity of the spectral bands, we can work out the masses of the atoms and force constants of the bonds causing the bands. To help the atheist position that the universe came into existence without a cause, one would need to find Raman bands appearing without being caused by transitions in vibrational quantum states, or alpha particles appearing without pre-existing nuclei, etc.
If QM was as acausal as some people think, then we should not assume that these phenomena have a cause. Then I may as well burn my Ph.D. thesis, and all the spectroscopy journals should quit, as should any nuclear physics research.
Also, if there is no cause, there is no explanation why
this particular universe appeared at a
particular time, nor why it was a universe and not, say, a banana or cat which appeared. This universe can't have any properties to explain its preferential coming into existence, because it wouldn't have
any properties until it actually came into existence.
A last desperate tactic by skeptics to avoid a theistic conclusion is to assert that creation in time is incoherent. Davies correctly points out that since time itself began with the beginning of the universe, it is meaningless to talk about what happened ‘before’ the universe began. But he claims that causes must precede their effects. So if nothing happened ‘before’ the universe began, then (according to Davies) it is meaningless to discuss the cause of the universe’s beginning.
[Author: Jonathan Sarfati, Creation Ministries International. First published in: Creation Ex Nihilo Technical Journal 12(1):20-22, 1998.]
http://christiananswers.net/q-aig/aig-c039.html