"And his tail drew the third part of the stars of heaven, and did cast them to the earth."
According to Christian theology, of the angels created by God, one-third joined with Lucifer (or Satan, the Devil) while two-thirds remained loyal. Bad things happen on earth because some people listen to the devils; there would be nothing but good if we would all just listen to the good angels.
But what could they possibly have argued about, resulting in the split? The Bible does not say. God made them all, but apparently they were not identical. God presumably made Heaven, but apparently 1/3 of his creation thought it was defective in some way.
If earth is a reflection of heaven, if man is made in God's image, then the trouble probably started on a committee. An unimportant committee, like one set up to decorate for an annual event. "Do we have to do all gold again? I mean, everything is gold here. How about a little platinum? Platinum would really liven things up!"
The next thing you know all sort of reform and improvement movements would crop up among the angels. "I call this piece of gold a saxophone." But no, God and his gang of followers have decreed harps are the only musical instruments allowed. Soon angels are having secret, informal meet ups in platinum rooms to listen to saxophonists and watch performance art.
Or it could have started with some angel, not necessarily the eventual leader, Lucifer, being a smarty-pants. Authorities don't like smarty-pants, as I learned from my parents and Catholic School. Smarty-pants have trouble understanding that most angels like the way things are, and prefer stupidity to change. Smarty pants and heresy amount to pretty much the same thing.
"Hey, here's an idea, since this breathing life into clay figurines hasn't worked out very well. Let's start out with building something simple, I call it a protozoa. The protozoa will be able to adapt to the environment (a major reason for clay figurine failure) and have sex, and thereby produce improved protozoa each generation. They can evolve over time to have many cells, be bigger, and differentiate into species to form a mutually evolving ecosystem."
Then again it could have been cosmological questions that set angels against each other and against God. Perhaps that started as a philosophical argument about determinism (fate) and free will. The determinism angels favored the clockwork universe. The free will angels favored introducing chance, in the form of quantum probability waves for the small particles which they argued would make a better universe than just paving the streets with gold.
I suspect that God gave the smarty-pants angels earth because he could not get it to work to his liking. It was just a bunch of clay figurines dancing to his instructions on a globe of solid gold. The lazy two-thirds of the angels just went back to God and their harps.
But the entrepreneurial angels mixed things up. Earth ended up with an iron core and a stony crust with water that could support bacteria and then algae and protozoa and higher life forms.
So here we are. Unfortunately, apparently when God saw how well things were going he got jealous and tried to take earth back. Having perhaps learned a bit from the smarty-pants angels, he decided to invent a dozen or so major religions to compete with each other for the hearts and minds of homo sapiens. If you want a stupid religion to believe in, there are plenty of choices.