Can you? What's the purpose of your question, if not to say we can't prove anything?
So why are persons coming on a forum and dogmatically says the equivalent of ?this is so, and that is so"?
How do you suggest we respond to that? Not. Prove it? Or should we say, "Oh. Okay. We don't know, So, maybe"?
I believe God is, because the design in nature speaks of a designer, and as said earlier - purpose.
If one believes different that's fine, but don't preach it as fact. Otherwise, I'll ask you to prove it.
You can't? Then why push it at people as if you know? Ego?
When I say you, I don't mean you Evangelicalhumanist... unless you are guilty.
And the plain fact of the matter is, you actually can't "prove" an enormous amount of stuff about the real world. (Formal mathematical and symbolic logic systems provide ways to "prove" much, but as Kurt Godel showed, they are incomplete by definition.)
But what you are failing to notice is that you can provide bucket loads, tanker loads, ocean loads of evidence to suggest that a lot of things, even though you may not be able to "absolutely prove" they are true, are at least worth giving a lot of credence to. Gravity, for example -- we have enough evidence that it works that I'm willing to bet you don't ever attempt to walk of the roofs of tall buildings.
Now, when I honestly "don't know," (in the sense that I've just given, not in the sense of being able to formally prove or disprove), I do say so. I do not know how life began (abiogenesis), and with my present level of bio-chemical knowledge, I'm unlikely to ever know. I've read much on the topic, understood a little of it, but cannot say anything dogmatic about it. Evolution, on the other hand, is something that I have studied in depth (again, at my level of scientific sophistication, which is slight compared to those working in the field), and the evidence before my eyes is absolutely overwhelming.
But you see -- I actually have been looking at that evidence, while you have been trying desperately to ignore it. And ignoring something is the world's most perfect means of acquiring no knowledge about it.
So let's talk about "purpose." Let's talk about the "purpose" behind all the forest fires last your in the western US, and this year in Canada, and the billions of lives that were casually wiped out, in great fear and agony, and with stupified ignorance of why they were dying. Or the dear caught under a fallen limb, unable to escape, dying slowly of starvation, never understanding what is happening, but in misery all the same. Let's talk about the "purpose" of the icheumon wasp, and why it has to lay it's eggs in a living creature that will die an agonizing death, instead of in a lump of already dead organic material, which other creatures can do. Let's talk about the "purpose" of all the parasites that can cause so much misery to both humans and animals -- blindness, terrible diseases, even more terrible deaths.
Let's talk about the "purpose" of that most intelligent creature, the octopus -- so very clever, but usually dying as soon as it produces offspring.
You see, you can talk about "purpose," but you could not possibly give "God's purpose" for any of the things I've mentioned. And if you can't tell me WHAT the "purpose" is, it is only a blind guess on your part that there IS such a "purpose." Nothing more than a blind guess. You don't know THAT it is if you don't know WHAT it is.