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No... I don't think it really matters. If you know a lot about angels and their attributes from the bible (evil or not), you might find that their actions in the bible are inconsistent with that of demons... i.e. no fallen angel would have any need or desire to 'possess' a human body. Their bodies are already far superior to ours, and it would simply be of no use to them. Demons on the other hand are disembodied spirits. They DO desire to control flesh, because it is something they used to have but have lost.
So... the question then becomes... where did demons come from if they are not fallen angels? There is also discussion about the original greek translations of the phrase 'formless and void' in Genesis 1:2, which is said to be more like the aftermath of destruction, rather than the emptiness following creation as most assume. So, if Genesis 1:2 is describing the destruction of earth, what was destroyed?
This then takes us to other various scriptures which give hints and implications of a race of beings that existed before Adam's time. Which ones? I don't know... I got most of this from a sunday school class taught by someone who was EXTREMELY familiar with Hebrew... It made sense to me, and I know this guy well... someone who is closer to God than anyone else I can think of. He actually worked with Einstein at one point in his life... very smart guy.