This thread is almost inspired by another one, recently started.
I didn't even want to post in that thread. Because, experience tells me that Atheism has no dark sides, nor negative aspects.
An atheistic person learns to be autonomous from God. An Atheist is necessarily autonomous, given that they believe in no deity.
But this autonomy is what enables people to trust the human nature and to fight for the development of our mankind.
By rejecting superstition, fatalism, determinism, fear of God and so on.
Atheism is not a prerequisite for fighting for the development of mankind -nor does it ensure that every atheist will do so.
I believe that atheism can result in autonomy from erroneous and harmful religious concepts, practices, attitudes, mindsets, etc., but belief in God is not what causes things to be erroneous or harmful. Unfortunately, the assumed authority from God of some errors make it very difficult for people to allow themselves to see clearly or to be freed from them -but this is true of people under any assumed or imposed false authority -or under false assumptions about true authority.
If one believes theism to be a wrong course, then would not human nature be to blame for the error of theism? One certainly cannot then blame God.
My point is that human nature is not to be "trusted", as such. I would agree that the nature of humans is in need of improvement and development.
Even as a religious person, I would agree that rejecting superstition is desirable. My belief is not without reason or knowledge -but I can see why some would think so.
I also do not see that belief in God necessitates fatalism. From a biblical perspective, God often pleads with man to change their ways so they do not destroy themselves -that it is not enough to expect God to do everything for them.
Biblical study has also -in agreement with observation and experience -taught me that thoughts and actions determine the course of things -and that course can change by decision. Such is the nature of creativity. God is a creator who is creating more creators.
The whole point is that everything can be any way -but that we have to make certain things don't go the wrong way.
Gen 11:6 And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do.
(With God, however -as it is with man -certain wills and decisions are coupled with greater power and authority -and so have a greater capacity to determine. God determines until we are able to determine without destroying everything -which would be necessary even if man were responsible for the task of determining his own course independent from God).
The fear of God (the Lord) is defined in the bible as the hatred of evil -though it does include a respect for his increased power and authority to determine.
However, I have definitely seen it twisted to be a debilitating mindset which keeps one from rational thought.
Still -it is not the belief in a God which causes this state -but a belief in God can be associated with this state. This fearful mindset is present throughout the human population.
An atheist is just as susceptible to being unwilling, unable, or fearful to question or consider things beyond their comfort zone -because they are also human.
If we assume that there is no God, we are not freed from those negative things associated with religion (and everything else) throughout history -they would simply be associated with whatever we then held as true, because we are human -ignorant of the whole truth, whatever it may be -and have great difficulty improving and developing our nature as a species -especially as our ignorance is constantly refreshed and sometimes renewed*.
(Dark ages -yes -associated with religion -some blame religion for it entirely, but many non-religious [even atheists] have been known to intentionally keep the masses ignorant for various reasons)
We still must learn to hate "evil" and "fear" that which should be respected for what it is -and tremble at the thought of defying it for our own sakes... be it nature or truth.
It is written that the nature of God is apparent in what was made, so an atheist or religious person would both benefit from an open mind.
*(To improve and develop the species requires improving and developing every individual -and we have a hundred or so years -at best -with each individual -then they die.
So.. we try to pass on as much collected knowledge and wisdom to successive generations as possible -but each individual and generation makes their own decisions -which sometimes include rejecting or even destroying previous knowledge and wisdom.
If we could somehow keep what was.... and who was.... already developed, improved and established....
)