Where do demons come from?

Demons come from inside people's minds ... they're imaginary.

Some people believe that demons are the angels that fell into sin and they come from hell, although this isn't exactly biblical lore ... it's add ons over the years.

Now that's a opinon, and every one has one. Also it is a theory,not a fact. What people do not understand,they in their own minds write off .

The Bible states in Jude

1:4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.

Also

1:6 And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.