(I could’ve sworn I wrote about this earlier, but I can’t find it in the archive now. So sorry if this is a duplicate.)
Let’s say you’re visiting a foreign country, along with a native. As you’re wandering the forest, you see a mechanical watch on the ground. You pick it up, open it, examine its mechanism, and wonder among yourselves how it might have come to be in the forest, who designed it, who manufactured it, and so on.
After walking a bit further, you see a computer in a glade, its LED lit, its fans whirring, its power supply connected to an array of solar panels, its monitor showing a CAD tool with plans for a watch. It says “Dell” on the side.
You ask your guide about this device: who designed it? Who built it? Who decided to install it in the woods, of all places, and why? He says, “It’s always been here. As far as anyone can tell, it’s been here since the beginning of time.”
Satisfied, you nod your head and move on.
This is, of course, ridiculous. A computer is a big complicated thing whose presence demands an explanation, and you can’t get around that just by saying that it’s always been there.
For those who didn’t recognize it, what I’ve done here is to combine two common Christian arguments. The first is Paley’s Watchmaker, which says that a complicated thing requires a complicated designer.
The second adapts the Kalam argument to Paley’s watch. Briefly: the First-Cause Argument says that life/the universe/everything is a big complicated thing that didn’t just happen on its own, and therefore demands an explanation. If everything has a cause, we can ask what caused life, and then ask what caused that, and what caused that, and so forth. Eventually, we’re bound to come to the Ultimate Cause, which has no cause of its own. And hey, let’s call that God because that’s what we’re trying to prove.
At some point, someone realized that if everything has a cause, then it’s fair to ask what caused God, and what caused the thing that caused God, and so forth. So the argument was modified to say that everything that begins to exist has a cause, and BTW God is eternal and therefore never began to exist, and therefore doesn’t require an explanation.
I hope I’ve demonstrated, above, that being eternal is not sufficient for not requiring an explanation. Heck, the four-color theorem, Gödel’s incompleteness theorem, Pascal’s last theorem are all eternal, yet they’re all complex entities that demand an explanation. If “it’s eternal, therefore it doesn’t require an explanation” were true, math class would be a lot shorter. In other words, Kalam is basically a very fancy and roundabout way of saying “I don’t need to explain God because shut up is why.”
(Some people might object that I’m casually using “cause” and “explanation” interchangeably. Yes, I am. Because for my purposes, they’re close enough that the distinction doesn’t matter.)
No, what short-circuits the infinite regress of explanations is when we get to something simple enough not to require further explanation. An explanation for Paley’s watch might be “the watch was designed in the same way as a ship’s rigging or a water pump, but smaller, more delicate, and more complicated.
But if “God” is the ultimate simple explanation, perhaps a principle of logic, like “0 = 0″, then that god loses a lot of the attributes that people who want God to exist really want that god to have. Like caring about their welfare. Like being aware of them, or indeed, of the Milky Way galaxy. Like being capable of noticing those sorts of things. Which “0 = 0″ doesn’t. I’ve had people tell me that there are arguments to show why the Ultimate Uncaused Cause must necessarily have been a Jewish carpenter who was executed 2000 years ago, but somehow they never got around to presenting these arguments.