How do demons exist and how do they multiply?

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Nothing would exist unless God let it exist

The existence of everything depends upon the God

Kosmos means the universe

When Satan was created, he was not Satan, he was Lucifer

Isaiah 14:12-14 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north:
I will ascend above the heights of the clouds; I will be like the most High.

Satan was an Angel but his ambition made God banish him from heaven

According to brother Eli, Satan want to be equal as God so he was thrown down from heaven

Demons are not created as demons, they become demons because they were falling Angels
Jude 1:16 These are murmurers, complainers, walking after their own lusts; and their mouth speaketh great swelling words, having men's persons in admiration because of advantage.

The demons do not multiply like human being do multiply
Revelation 16:14 For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.

Angels that want their own dominion apart from God own are demon, so they were sent to heart and they become angels of Satan