Well, a couple of observations:
The main problem with all these theories goes to the first cause. Who created the intelligent designer? What created the Big Bang? It’s essentially the same argument.
The Natural Philosopher Leibniz stated that if we are to describe the world we must do so in terms of the things of which it consists.
Both the Big Bang, and ID fail in this test. Don’t get me wrong, I think ID is a bag of dirt, but it’s interesting that they share this common flaw.
I think this is what the OP is getting at.
And, I have an answer… of sorts. The question itself may be meaningless, or a logical fallacy. It seems obvious to us that everything has a cause or a precursor because that is the world that we live in and that is what we have come to expect.
Just because it seems inherent to us that one thing causes another does not mean that the rule always applies… or for that matter… is common.
We know for a fact that matter is spontaneously created and destroyed all the time. We know this by observing Hawking radiation. This creation of matter exists outside of causation.
Causation therefore is not a necessity of the universe.
If we were to grant for the benefit of argument that the ID theory has a provable point such that life complexities “too complex” to spontaneously evolve (positing infinity, I don’t see how “too complex” is meaningful,) it does not necessarily follow that somebody had to come along and design it. The universe demonstrates that you can have a watch without a watchmaker.
Same goes for evolution and the Big Bang.
We deal in a world where air is everywhere. Early scientists figured that meant that air pervaded the universe. It is an easy misconception to make it to extrapolate local rules and conditions as universals.
Similarly, just because everything that we know came from something else doesn’t necessarily mean that this is a universal condition. There is in fact, no reason to think so.
Big Bangs just may happen without cause. There is a nonzero chance that another Big Bang will spontaneously occur in front of your monitor as you read this.
Big Bangs may be occuring outside of our universe all the time. Since our universe is merely the area defining the circumference that light could travel since our Big Bang, these would in fact be other universes.
Before the Big Bang, there was no time (or infinite time, it doesn’t matter really.) Positing a nonzero chance of a Big Bang occuring, it is inevitable that one would.
Tomndeb:
I noticed you were earlier trashing panspermia, but there’s nothing wrong with the theory. It’s really a question of odds.
If life arises relatively easily and spontaneously than the odds of it doing so are high, and it is unlikely that the universe will be populated by panspermia.
If life evolving is very difficult and rare to to such a degree that the chances of it arising are slim compared to the chances of panspermia occuring, than it is likely that that panspermia is the root cause.
We really don’t know what the odds of life arising spontaneously are, but the odds of panspermia occuring are deducable to a certain degree. I am convinced that it’s not especially unlikely.
We know for a fact that in its early years earth was routinely bombarded with matter, and this bombardment knocked material from earth out of the atmosphere.
So, let’s use an example: The dinosaur killer asteroid slams into earth and sends millions of tons of matter into space. Most life is instantly vaporized. Most of the material falls back to earth. Some vanishingly small percentage escapes earth’s gravity, falls to towards the sun, gaining velocity and shoots off into the Ooort cloud. Some percentage of this just keeps going.
Some of that material contains matter in which bacteria or viruses may have survived, or may be in a hibernation stage (the stuff in rocks, for example.) some of it may be shielded from radiation, and some of it may survive intact for millenia or longer as it travels. Some of this may survive a landing on another planet.
This is not too horribly inconceivable since we have rocks from mars that made it intact to earth and we examine these for signs of life. Such journeys do occur, or can occur on an interplanetary scale. Nothing precludes an interstellar scale.
Now it’s simply a question of whether these viruses, bacteria, or even self-replicating molecules can arrive in a hospitable area.
If the odds of this kind of thing happening are high compared to the chances of life evolving spontaneously than panspermia is likely, as life would only have to occur one to populate the universe given time.
If the odds of panspermia and spontaneous evolution are equivalent, than likely both occur.
If the odds of life occuring spontaneously are high compared to the likelihood of panspermia than panspermia is likely moot.
Until such a time as we can actually quantify these odds to a meaningful degree, pooh-poohing either theory is premature.