pre-adamites were around since Abraham.
The troubling notion you have brought up in regards to preadamites using this to support a racist ideology wasn't used until thousands of years later.
There are scriptures in the Bible that are being used for such ideologies now (however incorrect their ideologies are).
But, as mentioned by another ADer, a lot of things are not mentioned in the Bible. Computers, automobiles, firearms, nuclear warheads, cell phones, etc.
Since those are not mentioned in the Bible, can you really use the Bible to support any argument that since something is not mentioned in the Bible it must mean it does not exist?
http://en.wikipedia.org/wiki/Corrado_Balducci
