A God is a creator of both good and evil, for God creates impersonally with a choice. The role of a God is to create life, create universes, and populate them with living beings. The God has the burden of creating both good and evil creatures, objects and events. A God can only live from what it creates, and the God exists from the energies derived from his creation.
The Elohim as Gods carry the burden to have the complex knowledge and skill to create both good and evil. In the book of Isaiah Chapter 45: 5-7 it is written:
5 I am the LORD, and there is no other;
apart from me there is no God.
I will strengthen you,
though you have not acknowledged me,
6 so that from the rising of the sun
to the place of its setting
men may know there is none besides me.
I am the LORD, and there is no other.
7 I form the light and create darkness,
I bring prosperity and create disaster;
I, the LORD, do all these things
Angels are the preservers of what is created by God. An angel carries the burden of sustaining the life within creatures, to sustain their existence, to preserve them and to protect them. Angels do not have the power to create, which is a power which only a God has for angels do not have free will. Angels do not have the free will to do or not to do what they are commissioned to do by God. Like robots they follow instructions without question, so their errors are not their own, but the one that instructed them to do this or that.
An angel is like a doctor whose duty is to save and preserve lives. An angel is like a good police officer who duty is to serve, protect and preserve the order, rights and liberties of others. An angel is like a teacher that gives counsel, educates, enlightens, yet does not compel. An angel is like the sun that gives light, but you may choose to stay out of the light, it gives darkness but you may choose to turn on the light. A angel is like a robot programmed only to do good deeds. An angel does not start a cause, but preserves the cause hence remains blameless.
A demon is a ruler of everything evil created by God. Someone has to be in charge of evil deeds, bad creatures, poisonous snakes, vipers, death, and destruction. These are the duties of the demon, all that leads to death and destruction is their domain. They get to kill and enjoy it. Pain gives them pleasure. Misery is their comfort. Happiness brings them sorrow, life and living causes them grief, tears bring a smile to their faces.
A human being created with free will must constantly choose between good and evil. Adam & Eve were the first students of God, to be tested by the choice of free will of men. God told Adam not to eat of the fruit of the garden of Eden, for the day he eats of it he would surely die. The devil told Adam that if he eats of the fruit he would become wise as God. Surely enough they ate of the fruit and they become enlightened, becoming aware that they were naked. God called out for Adam, but Adam hid from the sight of God replying that he was naked. God asked Adam how he knew he was naked. Adam replied he ate of the fruit by the suggestion of his wife Eve, who was convinced by the devil. God created the devil in the first place, and God gave Adam the free will to choose one thing over the other. This test is what faces every man and woman each day. Each choice of action leads to something good or something bad. So would you rather be a servant in heaven as an angel, or a ruler in hell as a demon? May the blessing of God the father YHVH, God the son Holy Emmanuel, and the Messiah Jesus be upon you.