union68 said:
Regarding God and cosmology:
I am an agnostic that tends towards atheism but have found myself defending religion on more than one occasion. My issue with your prototypical, every-day atheist is not that I believe he/she is wrong, rather my issue is with their argument.
Well, it's certainly the case that there are a lot of horribly bad arguments out there. But there are also some good ones. Any good argument doesn't rely much upon specific things which we just don't yet know.
It shouldn't be too surprising, though, that the majority of atheists don't have a terribly good understanding of cosmology, simply because they aren't cosmologists.
In order to argue against a god, though, you first have to define what you mean. This can be a bit difficult, because different people mean very different things. I somewhat like the way Sean Carroll put it in the essay linked on the first page of this thread, but I would place it in somewhat different words:
By a god, I mean a creator that formed the universe, and had some choice in how it went about doing so. That is, it could have made the universe one way, but decided to make it the current way instead.
This obviously won't encompass every definition of a god. But it captures pretty well the idea of a monotheistic god as worshiped in most Western religions. Given this definition, we can very strongly say that there's no reason to believe it exists. The argument goes as follows: let's imagine that our argument in favor of this deity is to attempt to use it to explain some curious fact about our universe. Take your pick, it doesn't matter. We could be talking about the origin of the universe itself, or of the tiny value of the cosmological constant, or of the fact that life is possible. Whatever.
Now, we're also going to state that we have no direct evidence that this god exists, we're only attempting to use it to explain certain facts that otherwise seem difficult to explain (in other words, we're directly addressing the "argument from design"). Given this, we can compare this god hypothesis against a simple physical theory:
1. God hypothesis: this set of facts about the universe are the way they are because this god decided that it should be that way.
2. Physical theory: this set of facts about the universe simply are.
Now, this physical theory is basically the worst physical theory you could come up with: it's a complete non-explanation. But how does this worst possible physical theory compare against the god hypothesis? Well, there's a tried and tested philosophical tool that we can use here: Ockam's Razor. Since the two alternatives are exactly in the same accordance with the evidence, the question is which of the two is simpler.
Naively one might think that the god hypothesis is simpler: you are proposing one single entity to explain a variety of facts of the universe. But it's not quite as simple as this: the statement isn't as simple as "god exists", but also must include the properties of this deity. That is, we're not just talking about the number of entities, but the "algorithmic complexity" of the proposal. For example, if our proposal includes A = 2, B = 1, it doesn't mean anything to call the two one and the same thing, unless you can derive A = 2, B = 1 from some other, single fact.
What this means, then, is that if we want to reduce the number of parameters in the theory, it means that we have to explain two or more parameters as being directly derivable from the theory. So with the god hypothesis, for it to be an improvement, it means that we have to explain, say, the fact that the universe began and the fact that the cosmological constant is small as being derivable from one single fact that is a property of this god.
The problem is, the god hypothesis doesn't permit this: facts about the universe that the god hypothesis is purported to explain aren't derivable from any properties of this god. Instead, they are that way because this god decided that they should be. In principle, a generic god could have decided entirely differently, and so to fully specify this god hypothesis, we not only have to propose the aspects that are unique to the deity, but we also have to list out all of this god's decisions. In doing so, we end up with an explanation that has more parameters than that which it is purported to explain! By Ockam's Razor, then, the argument from design falls flat before it even begins, as it's not even as good as the worst possible physical model you could come up with, that those facts simply are.
So there you go, a simple argument that it's completely unreasonable to believe in a creator god without even referencing any specific facts about our universe.