@Alice_Linsley, I’m not sure your summation of the Eastern view is quite right. Are you a member of an Eastern Orthodox community? My readings of writings, by rank or file of that community, tend to describe the situation as:
Ultimately, all humanity has inherited human nature from Adam/Eve… and that human nature includes the inevitable inclination to sin. Adam/Eve were the first to sin. Each of their offspring will eventually have their first sins, but they will be their own sins, and not the first sin of Adam/Eve.
Also, several verses in Gen 1 say (paraphrase) “the land and sea gave forth plans and animals of many kinds”. That sounds very consistent with evolution to me.