Most humans have been given an innate ability to feel, to observe, to think, to reason, and to pray. But religiosity has always been used to prevent these given abilities to maturate to their full potential in the human. When one observes the multitudes of different religious cultures in world you can see the programing/brainwashing that has taken place. The strange thing is even though a person may observe that indoctrination of a false beliefs has been taken place in the other religious belief systems this person may not realize that he or she has also been programed like wise that has hampered this persons given abilities to maturate to their full potential. Throughout history religiosity has caused more pain and destruction then we can ever imagine.
While it riles me to agree with LG
p) on anything, I have to agree that this is mere confidence statement and nothing more.
You are starting with the premise that humans are brainwashed by religion, but unfortunately there is as yet no society / populace that can be said to be sufficiently removed from religion and its all-pervasive branches to be able to act as any semblance of a control-group.
The Western world is founded upon Christianity through its laws and thus its societal pressures, whether we agree with religion per se or more fundamentally the tenets of the religious beliefs. The Eastern world I understand to be equally so, although I am less knowledgable of that and stand to be corrected.
As a result it is impossible for you to prove any of what you say, no matter how intuitive it might sound.
For all we know it has been religion, and "religiosity" that has enabled humanity to reach their current status, by giving society a common understanding / goal etc.
If we are to discover a new race / tribe that has been cut-off from all matters religious for such a long time so as to be a valid control group - perhaps you could study them and make hypotheses etc. But until then (and unfortunately this is a highly unlikely scenario) what you are stating is nothing but a confidence statement.
And then there is the issue that whether religiosity is or is not the bane, or even is or is not a driver for development, of humanity, it is, of itself, neither evidence for nor against the beliefs of those religions.
i.e. whether religion has done good or bad is no guide to whether the beliefs of those religions are valid, correct, truth, lies, wishful thinking, mere possibilities, etc.
To think otherwise is logically fallacious.