If there’s one thing I thought I’d learned in this conversation (the most recent part of it — yesterday and today), it was that you may be able to meaningfully say that there was a first “human” couple if you define human relationally or theologically, but you can’t say that there was a first “human” couple if you define human genetically (H. sapiens) or behaviorally (“behaviorally modern” humans).
If I’ve got this wrong, I hope Joshua will clarify.