Narby, intelligent design is a fact of life. You guys are gonna have to accept that and modify your arguments. Allele frequencies are changed by bioengineers rather often these days.
That Allele frequencies are changed isn't the question. It's how the get changed that is the question, and you apparently believe that God was too stupid to use Evolution in order to do His work.
Don't look now, but I hope you do realize that one of the most common tools used by biologists to change gene sequences is to Evolve them. The only difference being that it is a "human selection" rather than a Darwinian "natural selection". The same biological operations are otherwise the same.