The Church is an act of God, uniting us with and through the Trinity.  Tenets and creeds are attempts to express the mystery of that, but they are clearly secondary to the action of God.

Sacrament is a Latin term for what is known in Greek as mystery. They exist not because of the tenets and creeds that define them, but because God gives them to us. 

Fellowship is a translation of another Greek word, koinonia, which was clumsily transliterated into communion. It arguably conveys the sense of koinonia better than the transliteration.