To clarify: it is your opinion that the Ark of the Covenant was an idol?
No, you muddied up the waters, you clarified nothing. I wasn't speaking of the past, although, it likely would have been an idol to the Jews of the Apostle Paul, had they had it available.
If it were to be found today, it would be worshiped by millions as an idol. Whatever it is in Ethiopia is likely a replica or imposter. Nevertheless, it will be worshiped by millions of Christless (never have been born of God's Spirit) professing Christians ("Christendom").