A humanist theory of the devil

So many things exist integrated together, daylight and darkness, winter and summer, green in the sky and purple in the dirt, all are real and none cancels out the other, so it is with goodness and evil. We can hold all these things in our understanding at once.
I do not know your personal theology but I do believe Evil is real, a force, whether personified as a devil or existing as some synergistic amalgamation of thought energies, I believe it is real, an entity. And I still hold to the belief that people are good. I think just as little seeds strangely grow into giant trees, little seeds of thought energy can grow into something huge, something that can move and act and have consequences unexpected and unnatural.
Thinking about evil, we made up the devil and demons for a reason, (and I not sure that they are not real). In order to uphold a belief in the basic goodness of people it is helpful or perhaps necessary to place evil outside of ourselves, to place that whole realm onto something "other," such as a devil, and grant that "other" near omniscient power to help us feel that we as simple humans are okay because the "the devil made us to it." That is not a terrible idea, but it is a bit infantile. As humanist what is one to do? I personally am okay with gods and demons being real beings, but I can't know for sure, and I am okay with that too. An interesting notion is one about energetic amalgamations.
Consider if any "normal" person places a significant amount time and thought energy into hatred, into visualizing "bad" things. Those thoughts are an energy, a force, a prayer if you will. Arun Gandhi said this week at Pellissippi St. College that anger is electricity. I have certainly experienced that in a literal way. Perhaps this is "Evil" as an entity. Similarly as one expends significant time and thought energy on love, seeing the best in ourselves and others, projecting good outcomes, these thoughts are an energy, a force, a prayer. I believe these things are very real. Consider that these energies may somehow form an amalgamation that is a semi-autonomous being, it exists within the person (or group) and is fed by the person, but somehow grows beyond that person's normal humanity.
Persons of heroic goodness, how to they do the Herculean things they do? And if one believe in miracles, which I certainly do, how can these things happen? Bringing order out of chaos, health out of illness, without any apparent building or healing process? What energy as brought this about? It goes against the laws of thermodynamics that all things tend toward entropy. Again one can look to a Deity, but from a humanist standpoint couldn't the amalgamation of goodness energy form up into something greater than natural, a synergism becoming something super-natural?
The formation of these forces is brought about through words - "In the beginning was the word and the word was with God and the word was God." Adkisson (the TVUUC murderer) watered the seeds of anger with words and grew a being with tremendous force. That being did not go away when he was captured. But he chose and built who his is.
I believe this the essence of judgment and heaven and hell. Everyday in every thought we are doing judgement day by the choices, the judgements and decisions, that we make. Who we are is built of what we think and say "As a man thinketh is his heart, so he is." As we build our thought being, our energetic being, I believe it is eternal. When the body is gone that being we have built continues, isolated in hellish torment or finding union in heavenly grace and communion. I believe the amalgamated forces of these opposing energies are already there for us to call upon as we grow ourselves today. We can name as we will. For me, I call upon Goddess and her grandson Jesus.