"You are getting the issue sort of backwards"
No, you are not comprehending what the original poster was stating. The "negative" the OP is stating is our lack of knowledge. A 10 YO will make a statement that sound ridiculous to a 20 YO. A 20 YO will make a statement that sound ridiculous to a 30 YO, etc. Not always (definitely not a LAW), but it commonly happens. This has to do with experience on the older person's part. Look back in time in science. There once was something called "ether", the world was flat, and the stars, sun, and planets rotated about the earth. All have been proven false. Other long term theories have been proven false too, like Newton's gravity model even though they are close enough for a lot of work. And I'm sure that Einstein's relativity and quantum mechanics models will likewise be proven false. So the OP is stating (and I agree), how can you disprove God when there is some evidence (why are we here, incredible complexities, irreducible complexity, etc). And I guarantee you that people in 100 years will look back at some of our quaint and downright stupid "laws" and "theories" much like we look back 100 years and think "how could those guys believe that?" Basically the OP is stating that we are ignorant idiots ... and he is absolutely correct. Therefore how can you logically ignore or totally discount a branch of knowledge. Or to rephrase - religion has incorrect theories past and present, and science has incorrect theories past and present, therefore I need to keep an open mind and keep searching for the truth and not latch on to some so called "expert" of the day.
"Ignorance is not a theological argument"
Your right. Ignorant theories like "dark matter" and "dark energy" are akin to "ether" and certainly sound silly when compared to theology. I see many people (thousands) wasting their lives and time chasing such theories (like ether and others). At least theology has been shown to be beneficial to health in multiple studies (like marriage, eating healthy, etc.) and waste your life less than crackpot scientific theories. There are very useful branches of theology just like I've used Newtonian mechanics. Both are wrong in toto, but have there is enough there to be extremely useful.
"I'm an atheist because I see no reason to believe in God"
I believe in God because science has PROVEN to repeatedly fail. And I'm a rocket scientist of all things. Science is like any other tool, good for some limited things and utterly useless for most of the rest of life. There certainly has been a lot of crap expounded as religion and God throughout history too, but, like science, it is proven wrong and most people move on.
"Please stop acting as if atheists are the one making untenable knowledge-claims."
I never saw that anywhere in the OP. Quite the opposite actually. Specifically the OP stated "most of what the world pushes on you as the concept of "God" is complete crap". Sounds like he is claiming that the "religious" people are making untenable knowledge-claims to me. I saw him claiming to once be an atheist and with time has decided that it doesn't make as much sense since we ALL have incomplete knowledge. I.e. the older and wiser and more knowledgeable (s)he's gotten, the more (s)he doesn't know. And many of us people in our 40's, 50's and beyond have realized how many DECADES we've spent on silly notions (both religious and scientific). We see Jesus calling the religious establishment (pharisees and saudicees) of the day "hypocrites" and "a brood of vipers" and we know exactly what he was talking about. Or in modern day parlance "see the new boss, same as the old boss". Or "it's hard to see the signal through the noise". We live in the noise in both religion and science and the OP and I refuse to fully believe either. Particularly the so called expert pharisees, physicist, "savior" presidents, etc. Science and religion are 90% crap, but that doesn't invalidate the other 10%. He I like that. I think I'll make it my new sig!