Excellent post.<quoted text>
The two opposing forces, originated in ancient Persia and was a concept Zoroaster concocted over 5,000 years ago. Ahura Mazda (good or light) and Angra Mainyu (evil or dark).
Before that time, dark and light were thought to be one. As we all have both within us and the theory is to accept every aspect ourselves in order to achieve balance. A concept found in Taoism and Buddhism, both of which are older than Zoroastrianism.
Between the origins and medieval times, when christians recycled the concept, Ancient Greece and the rest of the world embraced the terms, which were given western meaning (language wise) by Socrates, Plato and a few other philosophers. Good and evil.
I can't really think of any aspect of christianity that is even remotely original other than the blatant encouragement of ignorance, yet even that can be found in others.
The bible is the op shop of religions and belief is not required to acquire knowledge of any kind, if anything, it is preventative.
In Judaism, it is believed that humans have a combination of "good" and "evil" and that both need to be in balance.
Totally "good" and you can't survive, totally "evil" and you won't survive.