I wrote this article, and I thought you might be interested in reading it as well and be free to agree or disagree of course!
"As a continuation of my other article, I decided to make a follow-up post since while people might be aware or not, Cartesian dualism is one of the primary reasons why we have modern science and consider Atheism to be an equally valid philosophy alongside religion.
To understand why, we must first look into how Descartes defined the universe, namely that of the physical and the nonphysical. Everything we can touch, see, smell, feel and taste are of the physical world, everything else not such as thoughts and ideas. Basically a dichotomy made of the abstract vs the concrete. To consider the universe physical, we must also consider it as an object made for study as we can study the physical world but we cannot study the nonphysical (according to old belief, we now know we can study the mind as proven in Psychology and similar sciences).
In science, we are to reject the nonphysical since it cannot be properly reviewed. We look at the physical world as an object, something which can be rationally understood. Not surprisingly we started to reject Christianity and the Church by the time we also started to believe in Liberalism, in personal responsibility and freedom and that every individual matters in comparison to rather seeing a group of people than a group of individuals. To understand why the development of Liberalism is important we must understand that without a Divine Creator who has laid all the rules for us to follow, the only one being able to take responsibility is oneself. Personal resonsiblity, free will and freedom are the underlying foundations of Liberalism and Atheism too embraces this idea, since if we don’t believe in a Divine Creator and a Holy Scripture then we only have ourselves to blame for our earthly faults and we must learn how to deal with it. Our morals come from ourselves, not from a Creator Mystique. In summary, one can basically say that by the time we really started to believe in the world as an object and rejected the nonphysical during the Enlightenment Era, Liberalism and then Atheism were later to be born. It is also interesting to see that it was at this point when the church was split between Protestantism and Catholicism, the former believing more on individual responsibility than the latter, thus also rejecting ideas such as Original Sin, which claims that we are to be blamed for the faults of our ancestors, thus rather grouping people up in a huge collective than seeing them as free individuals. This strongly opposes the idea of individual freedom and personal responsibility and was easily solved with the idea of baptism. Drop your head in some holy water and voila, the Original Sin is gone.
With the help of the Enlightenment Era we would soon give birth to Industrialism and it is now science is finally is starting to seriously take a spin. Many huge scientific improvements were made around the 19th century or after that time and in fact we all got monsieur Descartes to thank, making us believe that we can actually view the world as an object. In such a sense isn’t it all also very ironical that we now are rejecting his idea of Dualism given that it was his idea of the physical world that planted the first seeds into developing modern science? Regardless, Atheism rejects anything made of the nonphysical and at least claims that if such a nonphysical world would exist, it too is a part of the physical world but not yet properly understood.
In a sense, we can actually say that the Abrahamic religions were doomed when they first introduced the concept of a soul and a nonphysical world. They in fact, planted the ideas which would later spawn Atheism since Atheism is more or less the rejection of the nonphysical, but such a concept cannot exist unless we are to believe in a physical and a nonphysical world, as later laid out and defined by Descartes. When Christians argue that Atheism then is a necessary evil, maybe we should try to explain to them that they themselves laid the foundation for such a concept and as they continue to believe in a soul and a nonphysical world, and that they will just help Atheism to spread further as it also of course allows the belief of the opposite, which also is equally amusing when you think about it. Therefore I think it’s pretty safe to assume that Atheism will only cease to exist (as Atheism) when we have completely given up the concept of the nonphysical. I just want to clarify that this doesn’t mean that future Atheists will refuse to reject the nonphysical, but as we move more into a belief of a monistic world, then the concept of Atheism isn’t needed anymore as there is no longer a reason to reject of what we today know as a nonphysical world."