Yet, this idea is pretty clearly implied by the Fourth Gospel from three sets of statements: that Jesus is the son of God, that Men may become sons of God, and that Jesus is God.
However, the fact is not usually noticed due to the near-universal practice of reading scripture with a prior (non-scriptural) assumption of strict-monotheism - leading to the mystical-paradox of standard Trinity theology, which itself assumes that God is qualitatively distinct from Men.
Also, the Synoptic Gospels (and/ or Pauline Epistles) are, in practice, regarded as primarily authoritative - whereas I believe that the Fourth Gospel is the most authoritative book of scripture.
Anyway, the passages in the Fourth Gospel which lead to the conclusion that Men can become fully divine include the following (there are others).
Jesus is the son of God
Men may also become sons of God (like Jesus already is)
John 1: 12. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 13. Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
Jesus is himself God
John 1: 1. In the beginning was the Word, and the Word was with God, and the Word was God. 2. The same was in the beginning with God. 3. All things were made by him; and without him was not any thing made that was made.
20: 27. Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing. 28. And Thomas answered and said unto him, My Lord and my God.