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Oh, the old standby of evolutionists - if something happened it is proof of evolution, very convincing, very scientific - NOT.

Are you thus saying that allele frequency doesn't change over time? If so then you should demonstrate how alleged observations of such are false.

Most arguments against "evolution" are actually arguments against common descent -- that humans originated through a chain of descent starting with "simpler" life forms whose offspring were subtly different and survived based on their ability to exist within their environment. Attempting to argue that the event of basic evolution -- change in allele frequency over time -- will put you in a very small school of thought not adhered to by most creationists and will rightly brand you as a luddite.

You asked for a cause of change in allele frequency over time? Mutations through a population cause it. I can't give you a "why" for mutations because there are a number of possible reasons (and by that I mean that a number of methods could cause the mutation, not that there are competing theories for the cause) for an organism to pass mutations to their offspring. How those mutations occur -- be it radiation, an adverse response to temperature, a virus, etc -- isn't relevant. That the mutations occur is what causes the change in allele frequency.

If you are going to argue against common descent, then fine. Just understand that common descent is an extension of evolution, it is not evolution itself. If you are going to argue that mutations never occur, then you're going to have to provide a lot of explanation for thousands of observed phenomena