Bingo!!!!
The Argumentum ad Constaninem doesn’t explain why the Oriental Orthodox and Assyrian Church of the East remain so close to Catholicism despite the fact they broke with Rome in rebellion against Constantine’s successors.
The Constantine folks seem to forget that his immediate successors persecuted people like St. Athanasius for his orthodox confession of faith.
Perhaps the Evangelicals who bash Constantine are closet Arians. :)