Does biology need the theory that all life shares a common ancestor?

Thanks for this apology, Dredge. I think your new title is an improvement. They sometimes go too far defending evolution here at BioLogos that it seems to turn into the ideology of evolutionism. They don’t seem overly occupied with Darwin, though, and the term “Darwinist” doesn’t really seem to fit anyone here, except perhaps like one biologist above who seems to think “Darwinism” means simply “natural selection” & “common descent.” It will likely take biologists pushing back against each other, as some have done, and as the Third Way and Extended Evolutionary Synthesis is curiously starting to do, to get Darwinist ideology cleansed from their ranks.