A little family disagreement. When Constantine moved the business and social center of the World from Rome to Constantinople they got a little confused.Wait, hasn't the Catholic church been the same, yesterday and today?
Sounds like you've got something akin to a Disciples of Christ branch, a Stone branch, and a Campbellite branch to me.
But they are an apsotlic Church with valid sacraments and believe in the real prescence and of course appreciates the Mother of God like us. Of coures they did a little splitting up without Authority.
They have beautiful cathredals and liturgies.