Most Ethiopians were polytheist during d'mt, also its was not Ethiopia it was Eritrea. Somali is a clan and nomad society, no much civilization there. The Christian kingdoms after Aksum in Ethiopia were just expansionist killers, they didn't accomplished anything, in terms of building, except Zeagwa.
Don't be that negative, Ethiopia has had a long-lasting dynasty, with rulers who built multiple castles, towns and because of their bureaucracy, we can still read about their history.
In Africa, this ain't common. I agree that Somalis accomplished some things in History, but we shouldn't downgrade their legacy, to uplift ours.
Peace