A simple challenge for atheists

[Esquilax]

It really really depends on what you mean by blind. Mutations themselves are blind in the sense that they do not usually change their rates to accomodate environmental factors, no?

I think the better way to phrase it is that mutations are blind, but their persistence is not. You can get any mutation (though one might add that even those mutations are constrained by what it is possible to express via existing genes and their potential for change) but those that we'll actually see over more than one generation are not blind in the least, as they're constrained by a very specific set of factors relevant to the organism in question.