I was really hoping you'd explain why uniqueness somehow disproves evolution, but oh well. Guess I'll just destroy yet another of your theories.
Of course evolution doesn't explain the uniqueness of fingerprints. It has nothing to do with it. As others have said, it is because of sexual reproduction. Since you don't understand that, I'll explain further.
In sexual reproduction, both parents provide genetic material for the offspring. Therefore, the offspring is identical to neither.
Of course, this isn't a simple cut-and-paste job. My parents are both dark haired. Therefore, you would guess any children they produced would be dark haired as well. You would be correct for the first two, but my youngest brother is blond. This is because my mother carries genes from her father, who was blond and light-skinned. Because of the nature of genetics (I bet I'll have to explain this later) this gene skipped her to surface in her offspring.
Because no one else shares my parents' unique genetic histories, no one else would produce children with identical fingerprints, irises, etc. They are unique precisely because of the randomness inherent in sexual reproduction, yet you are trying to use this uniqueness to prove a lack of randomness. This is why we laugh at you.
Now I see that with this...
..you seem to think that evolution has a way of dumping traits with no survival value. It doesn't, which is why we carry around junk DNA. In fact, if evolution had dumped useless traits that might be an indicator of an intelligent designer.