Since they've thoroughly lost the logic debate decades ago, theists can only claim a need for their useless beliefs on the grounds that humans need morals/ethics to keep society from descending into chaos.
I agree. However, religious belief is further flawed in the realm of morals/ethics, and their only claim for the foundation of it all is the belief in an imaginary gaseous vertebrae in the sky you can telepathically communicate with, and that flawful humans are built on his perfect image.
Once you go the logical route and ditch all irrational theistic myths, a tough question presents itself. This leads many atheists to be douchebag nihilists, who justify morally bad/evil behavior in the pointlessness/subjectivity of it all.
A rising school of thought is the rational, objective outlining of a secular justification for human morality and ethics. You will not go to heaven or hell for being good or bad, you will not necessarily have good things happen to you nor will bad people be punished, but then again god doesn't take care of that either so you're not missing anything. You will however, lead a much more fulfilling life if you can open your mind to Universally Preferable Behavior without the fear and coercion that religion brings, and without the emptiness of nihilism.
Learn how to use the scientific method to have better relationships with people, your family, your partners, stress, etc.
Intrigued? Enjoy!
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Seeing as I don't have all the time in the world to debate with the irrational, this thread is mainly for the benefit of atheists and maybe seesaw-dweller agnostics to discuss this system.