Eternal Sonship of Jesus

"The doctrine of Eternal Sonship simply affirms that the second person of the triune Godhead has eternally existed as the Son. In other words there was never a time when He was not the Son of God and there has always been a Father/Son relationship within the Godhead. This doctrine recognizes that the idea of Sonship is not merely a title or role that Christ assumed at some specific point in history, but that it is the essential identity of the second person of the Godhead. According to this doctrine, Christ is and always has been the Son of God."

Notable rejectors

Walter Martin

"The Scripture nowhere calls Jesus Christ the eternal Son of God, and He is never called Son at all prior to the incarnation, except in prophetic passages in the Old Testament. The term "Son" itself is a functional term, as is the term "Father" and has no meaning apart from time. . . . Many heresies have seized upon the confusion created by the illogical "eternal Sonship" or "eternal generation" theory of Roman Catholic theology, unfortunately carried over to some aspects of Protestant theology. Finally; there cannot be any such thing as eternal Sonship . . . . the word "Son" definitely suggests inferiority." The Kingdom of the Cults, pp. 117-118

See also