In most Bibles we read in Isaiah 9:6
For to us a child is born, to us a son is given; and the government shall be upon his shoulder, and his name shall be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace.
The seems rather odd, especially when we consider that Jesus Himself in His prayer, called the Father “the only true God” (John 17:3). The verse as given above seems to harmonize only with Modalism—the view that God is a single Individual who expresses Himself in three modes: Father, Son, and Holy Spirit. This view is espoused by the United Pentecostal Church, and by the various “Apostolic” churches. If we are going to accept this verse as true, it seems we will have to accept Modalist theology.
However, the above form of the verse originates from the Masoretic text of the Jews, from the 7th to 10th centuries.
The Septuagint translation of the Hebrew Bible into Greek is a much older text. Here is how Sir Lancelot C.L. Brenton translated the verse from the Septuagint in 1851:
For a child is born to us, and a son is given to us, whose government is upon his shoulder: and his name is called the Messenger of great counsel: for I will bring peace upon the princes, and health to him.