There seems to be an unwritten rule throughout the universe; all things are balanced. If there is a Yin there also must be a Yang. Light exists if there also is darkness. Right is the opposite of wrong. Good is the opposite of bad.

Both demons and angels were placed on Earth with us to impede our path. By creating obstacles and conflict they cause us to think and reason to find resolution. In this interesting way, they force humans to develop and use more and more of our brains.

By learning to use those magnificent bicameral brains we would eventually discover and open our third eye and gaze upon the entire universe that exists beyond the veil. We would know and communicate with one another telepathically. We also would communicate with the other creatures of the universe; not only the aliens swirling in the astral around us, but with the animals that come from the Mother Earth.
The Earth is our mother. It is from her that our bodies evolved.

The religions have been at war with one another and keeping mankind in their grip for thousands of years. It was because of their influence that humans failed to evolve. Instead of seeing the god within ourselves, we worship the external god that we think exists somewhere else.