No. If anything it would be noted that only the Catholic Church, that is those particular churches in union with the See of Rome enjoy the fullness of Divine Revelation. The simple fact is that the Orthodox are actual Churches possessing apostolic authority and all seven sacraments or mysteries, sadly they are in error over some theological issues(they would say the same of us)
You are right about the mysteries...
Revelation 17:5 And upon her forehead was a name written, MYSTERY, BABYLON THE GREAT, THE MOTHER OF HARLOTS AND ABOMINATIONS OF THE EARTH.
In Christ...Alone!