Dear Friend,scripture says what an antichrist is ,which there are many, is described in 1 John 2:22
“”Who is a liar, but he who denieth that Jesus is the Christ? This is Antichrist, who denieth the Father, and the Son.”” 1 John 2:22
Take a look at what this Guy John F Mac Arthur teaches
From MacArthur's Bible study guide, The Superiority of Christ
“”the terms ‘Father’ and ‘Son’ would have no significance before the incarnation.” -Page 5
“”Did you know that when 2 Samuel was written, Jesus Christ was not the Son of God? Why? The title Son refers to Jesus Christ in His incarnation. Christ did not become the Son until He was begotten into time.”” -page 52
Here is more from Mac Arthur...
Some 900 years before Jesus was born God prophesied, “I will be a Father to Him, and He shall be a Son to Me” (Heb.1:5; 2 Sam. 7:14), indicating that in eternity past that, though there were always three persons in the Trinity, there were not yet the roles of Father and Son. Those designations apparently came into being only at the incarnation. In the announcement of Jesus’ birth to Mary, the angel Gabriel declared, “He will be great, and will be called the Son of the Most High;...the holy offspring shall be called the Son of God” [Luke 1:32,35]. Son was a new name, never before applied to the second person of the Godhead except prophetically, as in Psalm 2:7, which is interpreted in Hebrews 1:5-6 as referring to the event of His incarnation. John wrote, “In the beginning was the Word, and the Word was with God, and the Word was God” (John 1:1). Only when “the Word became flesh, and dwelt among us” as “the only begotten God” (John 1:14,18) did He take on the role and function of Son [emphasis his]. [John MacArthur, Jr., The MacArthur New Testament Commentary—Galatians (Chicago: Moody Press, 1987), p.108 (see his comments under Galatians 4:4).]