As far as I know (I would be happy to be corrected by more knowledgeable folk), Arabia never had cows native to the land. Camels yes. Horses too.
Neither Iran, to which it spread next.
So where did the practice of cutting cows come into the theology from?
Surely could not have been native to the land of its birth or origin. So was it ever a part of the original religion, or an geographical/regional adaptation that came later?
If it came later, then its not really Islam, is it? Because from what I've learned over the years, what came first was the final word. Never-changing.
Its a serious question, and I would prefer potentially butthurt bigots to take cognizance of my signature.