Contradiction with 1 Corinthians 13:12
While 1 John 3:2 speaks of seeing God as He is, 1 Corinthians 13:12 suggests that our current understanding is partial and indirect, implying limited sight of God.
1 Corinthians 13:12: For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known. [darkly: Gr. in a riddle]
Contradiction with John 1:18
Contradicts by stating no one has seen God at any time, contrasting the future vision of God described in 1 John 3:2.
John 1:18: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared [him].
Contradiction with Exodus 33:20
Asserts that no human can see God and live, conflicting with 1 John 3:2's promise of seeing Him.
Exodus 33:20: And he said, Thou canst not see my face: for there shall no man see me, and live.
Contradiction with Isaiah 6:5
Implies that seeing God results in ruin, contrasting the glorifying view of seeing God in 1 John 3:2.
Isaiah 6:5: Then said I, Woe [is] me! for I am undone; because I [am] a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts. [undone: Heb. cut off]