When I see a post like that, I actually feel pity for the unsaved. It's so dark, so narrow, and conflicts directly with every good thing that man is or could ever hope to be.
No you don't need a book to survive. You need the book, however, to live beyond the scope of your sadly restricted mind and your sinful, depraved and decaying body.
You're so blind, though, you don't even realize how pathetic man is, when he is without God. Without God, man is no better than an animal, and man has no redeeming characteristics.
Here we see the self-loathing that so often defines the hyper-religious.
From the rational point of view, the fundie cannot withstand a world wherein humans are the final owners of our destiny, that acts need to be watched over and adjudicated by the gods, and that human progress is inherently evil, base, hindered, impossible to be moral without guidance of the father figure. The fundie is in a psychological dilemma of superiority/inferiority -- they are so vaunted by their gods that the entire realm of existence was created exclusively for them, but they are so unworthy that they are but garbage in the sight of their deities. That is a prescription for a maldjusted personality, and again, it's evident by the seething passions that theistic belief has whipped up time and time again.
It's a nice thought, and I agree that human beings can and should be owners of their own destiny. However, the whole of human history demonstrates humanity of being capable of tremendous evil and inhumanity that thus far seems inescapable. As a premise that man is inherently sinful, history supports the Christians fairly well in that regard.
The U.S. has proven to be a shining light to the rest of the world in many ways throughout most of our history. It's no surprise that theists and atheists alike want credit for all that good shit. There is a psychological need being served by placing so much importance on the Christian "guided-by-God" founders pushed by the evangelicals vs. the deist, Enlightenment inspired founders pushed by the atheists. Both influenced the founders and it's high time we accept it and move on with our lives.
That man is inherently sinful, is a misleading term. Sin infers a theistic framework and honestly, I would hesitate to use the gods of the bibles as a benchmark for what is sinful and what is not. They are clearly lacking in terms of being the models for human existence.
The most basic rule of human sociality is non-zero-sum: no free lunch, scratch my back and I'll scratch yours, reciprocity. This is because a society made up of cheaters will (obviously) become fraught with suspicion, distrust, and peril, and will eventually fall apart. So we come to a consensus, a social contract that we all agree to live by under threat of punishment (also agreed upon by the group), and viola relativelaw, order, and stability. This is the template upon which all patterns of human society are formed. Here in the West, we've progressed through theocratic totalitarianism to liberal democracy. Thank goodness.
We are a mixture of selfishness and cooperation and it serves us pretty well. Most people do behave morally.