This may be a ridiculous question, but it's something that I've been wondering about nevertheless, and I can't seem to find anything written on the matter. Anyway, do you have any idea how Adam imputed sin to this universe? If evolution were true, then how could an "Adam" actually have existed?By "evolution" I assume you mean the biological side of the Grand Story, as JP Moreland calls it, which is how certain naturalists put forward as the way life emerged and developed on this planet. This includes a simple organism emerging from some prehistoric puddle and eventually evolving, by the mechanisms of random mutations and natural selection, into all of the various species we see today. You have to assume this Grand Story is true for your question to even make sense, since even 6 day young earth creationists accept that some life evolves, and biological organisms change from generation to generation.
Of course, the Grand Story is far from proven, and I'm not sure that, short of a time machine, it could ever be proven. To take what we have in terms of observations of biological organisms and extrapolate it into this Grand Story requires massive amounts of unbacked assumptions. Add to that the fact that the evidence strongly suggests that the mechanisms of random mutation and natural selection seem to be woefully inept at creating small changes in populations, let alone the vast diversity of life and biological function we see today, I don't think there's any reason to even dabble with thinking the Grand Story is true.
However, if it were, and humans were a part of this grand story, you could say much of the beginning of Genesis is metaphor, and Adam simply represents humanity or something, though this would seem to contradict the gospel writers and Paul, who seemed to consider Adam a real and historical person. It would require further explanation to solve those apparent contradictions.
Or, you could say that Adam evolved from lesser primates, and at that point God imported a rational soul into him, or he evolved his soul, or something of that sort, and that's when humanity began. But that seems extremely ad hoc (though not any more so than the Grand Story, ha) and then what do we do about Eve?
Of course I think these scenarios are highly contrived and don't think they're feasible for one that takes the Bible seriously. Frankly, as God's written revelation, the Bible has an epistemic authority that our often pitiful attempts at historical science do not have. When people get it wrong interpreting God's natural revelation, we have to dismiss what they say in favor of what God reveals, no matter how many defend the bad science or how emphatically they defend it. However, since there has been no good evidence that makes the Grand Story even begins to seem feasible, it's not a problem.
I tend to lean toward Progressive Creationism, though I am very open on the issue.