That's a somewhat shallow perspective on religion. Certainly in some religions there is the aspect of creating social order (which is not actually a bad thing, as most people prefer social harmony to chaos). But that is only part of the story.
Philosophers have always wondered about the nature of existence, the nature of the self, the nature of consciousness, the mind, time, space, etc. It is the human condition to wonder about these big questions, and we have a need to be given some answers. Religion fulfils those needs, or at least it did in the past. Even in cultures without money and without any rich or poor, such as the American indigenous peoples, they still felt the need to have creation myths and a religion.
Most people are hardwired to be religious or spiritual. It's part of who we are. Just as most people have a sex drive, driven by hormones and brain neurotransmitters, most people also have religious or spiritual inklings. I suspect that people who are atheists by disposition just lack the appropriate hormones or neurotransmitters to feel the religious or spiritual impulse, so for them, religious material or culture becomes meaningless. Just as for somebody totally asexual due to hormone deficits, they would not find sexual alluring pictures of any interest.
As for original sin, do you know that this concept originated in gnosticism, and was only later transferred into Christianity? Gnosticism paints a bleak picture of the world: in the gnostic view, the god who controls the physical world is evil, and he prevents humans from contacting any higher benevolent gods. This evil gnostic god, called the demiurge, entraps humans in a debased physical world of his creation.
As someone who has suffered decades of misery from chronic illness and attendant mental health issues, I can see why some people would like to create such a miserable religion as gnosticism, because it reflects the reality lived by suffering people. People who have been fortunate to have led a great life with minimal suffering probably do not see our physical world as debased; but people who have suffered a lot may take a different view about the nature of our world.
Gnosticism by the way does not really support the idea that religion just tells people what they want to hear; nobody would want to be told that they live in a gnostic universe. I find it depressing even just to read about gnostic ideas.
I used to be a very spiritual person, with great interest in Eastern mysticism; but then a viral brain infection I had two decades ago damaged my brain, and ripped out all my spiritual inklings. So now all the spiritual books on my bookshelf have lot all their meaning for me. This shows that religion and spirituality are hardwired in the brain, and if something happens to the brain, it can utterly change your perspective on spiritual matters.
For me, losing contact with these spiritual energies that I used to enjoy (and which gave my life depth and meaning), is one of the reasons I find life so bleak and miserable now.
