Some philosophers and scientists have argued that for phenomena like consciousness, human morality, and some instances of biological complexity, explanations in terms of natural or evolutionary theses have not and will not be able to provide us with a complete picture.Therefore, the inference to some supernatural force is warranted
But appealing to the supernatural is not warranted simply because some things haven’t been explained yet. That’s a logical fallacy – an argument from ignorance.
atheism is an absolute statement
Atheism isn't a statement at all beyond the answer "No" to the question of whether one believes in a god or gods.
Nor is there anything absolute about atheism. It's the flexible position that one chooses to live as if gods don't exist until a reason to live otherwise surfaces.
it seems that nearly every atheist I meet believes that science has somehow justified their atheism.
Not this atheist.
What justifies my atheism is reason, not science. Rational skepticism coupled with empiricism have proven themselves to be valuable ideas. When applied to the matter of how the world works, they transformed alchemy, astrology, and creationism, all sterile systems of thought, into chemistry, astronomy, and modern biology, all stunningly successful.
Rational skepticism and empiricism applied to daily life gave us secular humanism and rational ethics, a huge improvement over monarchies, theocracies, and received, allegedly revealed, ethical systems. Today, we have citizens with guaranteed personal rights living under the rule of law instead of subjects submitting to the whim of tyrants.
So, I have excellent grounds for respecting the application of these two wildly successful ideas to the problem of gods, where they yield atheism. That's how I justify my atheism – with pure reason, not with science.
Science has, however, made it possible to be self-respecting atheist, especially the great discoveries suggesting that the universe and the life in it might have self-assembled over billions of years.
There's also the matter of science continually replacing supernatural explanations contrived by people who didn't know where the rain came from with scientific explanations that removed deities from the process. We have many very useful scientific theories, none of them containing a god, and none that would benefit in terms of explanatory or predictive power by the ad hoc insertion of one into any of those theories.
Science has shown us that every creation myth is false, another reason to be disinclined to accept the reports of believers.
And scientists have been studying our reality at every scale from the subatomic (Higgs boson) to the cosmological scale (WMAP) since the invention of the microscope and telescope, and have never found a scintilla of evidence better explained by positing a designer.
The gaps are closing. It not only appears that we don't need an intelligent designer, it appears that there would be nothing for it to do.
So, while I agree that none of this disproves the possibility of a god or gods, it does allow one to live life as if either none exist, either because they don't, or because if they do, they either are unknowable or choose not to be known. In either case, atheistic life makes more sense.
theism is based on value, not evidence.
Then to the person who finds no value in theism, there is no reason to participate in it.
No one is proposing that there is actual proof of the existence of God. No one sane, anyway.
Sure they are. Many if not most theists claim that the existence of a god or gods is a fact. We call them gnostic theists. Are they all insane?
Being skeptical is a characteristic of agnosticism. Not atheism.
Rational skepticism coupled with empiricism is the justification for atheism, meaning that skepticism underlies most atheism. Rational skepticism, or the unwillingness to believe without sufficient supporting evidence, combined with the dearth of credible evidence for gods leads to atheism.
The agnosticism of the agnostic atheist derives from his recognition of the limits of knowledge on the matter of gods.