I would think that as Christians we would want to fully exercise our inquisitiveness for truth into the matter of where these creatures come from.
How would you do that?
The Bible tells us that not all people have the same origin (as Christ and Malachi say), and that some people's origin is in lies and death. But it does not tell us exactly where they come from.
And that is the best we will ever have, because even if we found more information that seemed to confirm some Biblical themes, well we would still have to be very cautious. The Bible is our foundation, everything else is tried by that. We put the Bible first, that is the answer we have, and the word of God is good enough for me.
I mean what else am suppose to consider? The creation myths of the devils? The abos say they came from the rainbow serpent. The Bibles says they are of the serpent, so I wouldn't dismiss it entirely but I am not going to take a niggers word for it.
The only foundation is the Bible, it is the only witness I fully accept.