They reason backwards: Birds evolved, therefore some poorly understood mindless processes must have driven them to evolve.
It’s telling that one kind of evolution always seems to be missing from these “theories” about the evolutionary origins of religion.
Evolutionists now increasingly believe that major adaptations are driven by neutral mutations.
The traditional “Out of Africa” theory is being abandoned as weakly supported by evidence, in favor of a welter of other hypotheses.
“Science is a wonderful thing, but human zoos, scientific racism, and eugenics were shocking betrayals of science.”