> Is we don't know what the explination is, would I don't know be a valid answer?
Normal, yes; valid, no. We often have to say "I don't know," and usually that motivates to push us further into seeing if we can arrive at an explanation. That's where science came from and what it's all about. But "I don't know" isn't usually considered a valid answer. Instead, it's a temporary and motivating one.
> In whaat way is the universe orderly unifrom or regular?
We can predict the time of sunrise and sunset, of the spring and fall equinox, of the return of Halley's comet, of solar and lunar eclipses, of Mercury retrograde, of Pluto's orbit. We know the gravitational constant (key word is "constant," meaning regularity and predictability), the strong nuclear force, the predictable action of atoms, the predictability of chemical reactions, the constant nature of themes and charge of electrons, protons and neutrons, the speed of light, Planck's constant, Earth's orbit around the sun, the properties of the carbon atom, and a MILLION other things.
> And how would you establish it was purposeful or beautiful which are subjective terms?
Beauty is more subjective than purposeful. Beauty is in the eye of the beholder (though we all agree on ugly, don't we
). But as part of our science and philosophy, as well as literature and theology, we are always wondering about purpose, about why. It drives us, because we see purpose everywhere, and we can't help but ask the biggest question of all: "WHY?"
> Do we have any good reason to think that something beyond nature exists?
Nature drives us to ask the question. You'll observe that every culture, worldwide, throughout all of history, has found reason to wonder if something beyond nature exists. Religion is found in every culture, ever. So I would say with confidence that just about everyone in all of history has a good reason to wonder if something beyond nature exists, and by far the majority of people worldwide throughout history have found that there is good reason to think that something beyond nature exists.