"But why should that be taken as an argument against the concept of God?"

It shouldn't, really. If a person assumes that the Bible is the inerrant word of God and that it should be taken literally (i.e. the fundamentalist view), then if you contest the idea that God created the Heavens and the Earth in an actual six calendar days and that dinosaurs either did not exist or co-existed with Adam and Eve, then that person might assume that you are arguing that God doesn't exist.

But I offer a different view. My reading and study of astronomy and cosmology, with it's preponderance of evidence, indicates to me that the universe began 13 billion years ago with the Big Bang, and that then the working out of the laws of physics and chemistry eventually produced the earth and us. And an immense amount that we have yet to learn about. Hence, rather than assuming that I have total knowledge of the origins of "Life, the Universe, and Everything," I am open to new information and, if necessary, revision of that which was previously assumed to be true. Including the possibility that it may have all been started by some kind of deity or higher intelligence—the nature and purposes of which we do not know (no matter what the claims to the contrary).

My fundamentalist friend worships a fairly puny God (barely more than a modestly talented wizard with an ego problem, who can't seem to get it right and has to keep messing with it) compared to the kind of intelligence that it would take to create this vast universe by merely saying, "Let there be Light!" followed by an immense KA-BOOM!!! and the rest, this deity (?) knows, will follow without further interference or tinkering. Those laws of physics and chemistry, that the Deity knows full well, eventually produce the Earth and we who reside upon it. And the intelligent, technological kangaroo-like beings who inhabit Alpha Centauri Two, the highly intelligent octopus-like creatures on Wolf 359's single water planet who are not technological, but who are poets and communicate telepathically, the intelligent, technological, and very human-like inhabitants of Procyon Four, and the small, humanoid space-faring inhabitants of Sirius Three who occasionally drop in here to see what we're up to. . . .   And these, our brethren, in our fairly immediate neighborhood in the galaxy, whom we have yet to meet (as far as we know).

One can believe that there is a God—a being capable of creating this whole, immense universe (and perhaps an infinite number of others)—without buying the idea that the world was created a mere 6,000 years ago and that the "Wizard" in question dug up river mud and literally molded some dude named Adam out of it, then laid down a lot of "do's" and "don't's."

Like I say:   kinda puny compared to the hypothetical God I can imagine might possibly exist.

One likes to know of course. Some folks simply can't stand uncertainty, so they have to make up myths they can believe in. But I find that I am fairly comfortable with mystery. I prefer that to operating on totally irrational assumptions and vociferously denying obvious facts. Mystery is fine. If I knew absolutely everything, life would be boring as hell. There wouldn't be anything left to learn.

Don Firth