An atheist is someone who believes that nothing made everything. He will of course deny that because it's an intellectual embarrassment, but if I say that I don’t believe that a builder built my house, then I am left with the insanity of believing that nothing built it. It just happened.I will deny that, an atheist is someone who doesn't believe in a god or gods. It's got nothing to do with whether they believe something came from nothing, it's simply to say that appealing to a deity is not an answer. For the house I'm living in, I know a builder built it. And I also know that the builder had a builder too, the builder had two parents who had sex. And where did those parents come from? Well their parents had sex as well. And if we go back far enough we get to a point where sex organs first developed, and even further back we get to a process by which the first replicating cells came about. Before that we get planetary formation, before that we have a giant star going supernova, before that we have that star formation and before that we have the origins of the universe.
The big bang is the limit of our observational point, beyond the big bang at best it can be nothing more than informed speculation. There is mathematical means to try and understand how the universe could be, but in all honesty there is a huge unknown when we hit the end of observable reality. As far as what atheists believe there is no consensus, Comfort makes the mistake of thinking that science = atheism and appeals against current scientific explanations on face value in order to attack atheism. There is no dogma to atheism, no tenets, no historical account, it's a position on the the supernatural and nothing more.
What Comfort is doing is creating a false dichotomy between nothing creating something and the Judeo-Christian construct of God creating something. Though there are many people who don't believe that there is a creation event at all, that the universe or multiverse in some ways is unbounded and infinite. Hawking and Sagan both talk of this unbounded reality, where time has a beginning but time is a creation of the universe and the components that make up the universe are eternal. There's the idea of a cyclic universe, one that is an infinite sequence of big bangs and big crunches where the universe has a beginning and an end but is still fully contained in infinity. There's also the concept of an infinite sequence of multiverses, an 11-dimensional reality where the universe is one 4 dimensional bubble of many floating in a higher reality. It could be that the universe is infinite too, that the beginning is nothing more than a limitation on our observation point. It could be that black holes in one universe are the beginnings of a completely new universe within. Quite simply there is no answer.
But without an answer, does it make the Christian answer of an all-powerful deity creating it all. Why if a deity can be infinite, can't a component of reality be infinite? The big bang isn't the be-all and end-all of existence, it's the beginning of our 4-dimensional bubble universe. Our frame of reference limits us, but that does not make a deity any better of an answer. Imagine I had a box sitting next to me. Can you work out what is in the box without looking inside? Sure you could guess, and even make particular deductions about what could be in there, but the chances of being right purely on guessing aren't high. On earth it's limited to particular material objects, the size is important and the ability to to obtain it is another. The box that covers over what is beyond the observable universe isn't limited by these restrictions and without lifting the lid, getting the right answer becomes impossible. Proposing that God is an answer is nothing more than speculation, it has about the same probability as proposing that reality was created by a Flying Spaghetti Monster.
Comfort makes a very easy dichotomy to pick against God:
Darwinian evolution and the biblical account of creation are incompatible. Either God made man in His own image as morally accountable beings, male and female, reproducing after their own kind, or He didn’t. If the theory of evolution is a scientific fact, then the Bible should be discarded as mere mythology. But if the Bible is right, Charles Darwin single-handedly propagated a fantasy that has hoodwinked millions.So if evolution is true, then the bible isn't according to Comfort. Well evolution is true, it's about as true as true can get in the scientific sense. So by this the bible is mythology and God was killed by Charles Darwin... Of course this line of reasoning is bogus, evolution is just one of a huge number of naturalistic explanations that have replaced the divine intervention that was once the explanation. Why should evolution kill God any more than heliocentric orbit?
It's an easy path to dismiss God for the same reason that some theists reject evolution, if we take the argument that one is true and the other is false then it's really going to be nothing more than a gut reaction. For the scientifically-inclined then maybe it would go to God not existing, for the believer it would go to God. It's a dishonest tactic even if it stems from an honest belief in the incompatibility. The fact that many believers accept evolution including prominent scientists and theologians shows that there doesn't need to be an incompatibility between God and evolution.
The main straw-man attack is the deifying of Charles Darwin, that it's his word against God's. Evolution is a scientific theory, not a religion, and there are no holy books that show irrefutable truth. Indeed when Darwin first wrote the hypothesis of evolution, the fossil record was mostly undiscovered, anatomists were only beginning to see the links between different clades, there was no knowledge of genetics and observed evidence was not there. Since then the evidence found supporting evolution has been overwhelming, and the theory has been updated and revised as all science is.
It's important to mention that evolution is not the single-handed work of Darwin, Alfred Russel Wallace came up with the theory independently. Through the good grace of both Darwin and Wallace they presented their idea together in 1858, over a year before The Origin Of Species was published. Since then the concept has become standard science, with many contributions along the way. Mendelian genetics added to the theory in the late 19th century. In the mid 20th century the discovery of DNA again changed the understanding of evolutionary theory, which led in the 60s to the gene-centred view of evolution. The idea of evolutionary arms races came about, a new driving mechanism to variation. In recent times the role of horizontal gene transfer has come to light, and the idea of spandrels playing a role in evolution has been added to evolutionary knowledge. All of this is beyond what Darwin came up with, yet all is now part of modern evolutionary theory.
The fact is that evolution is accepted by almost the entire scientific community, millions of people from different religious backgrounds and all walks of life who actually devote their lives to studying biology all agree that evolution happened. It's not the word of Darwin vs the word of God, it's an accumulation of millions of scientists all devoting their lives to understanding the natural world against the allegorical tales of one middle-eastern tribe. If the bible needs creation to be true, then the bible is mythology. But if like most rational theologians taking the tale of genesis is an allegorical tale, then there is quite simply no conflict.