Why does the Orthodox creed omit the sentence “God from God?”
The Orthodox use the Creed of Nicea-Constantinople which was finalized in 381 AD. Although the Creed of Nicea had the clause “God from God” before “Light from Light,” the Greek version of the Creed of 381 did not. However, the Orthodox accept this clause as fully valid and have no theological objection to the fact that the Creed used by the Roman Catholic Church (Latin rite) includes this clause. The real controversy is over the expression “and of the Son” (filioque).