Contradiction with Matthew 7:14
This verse suggests that the path to eternal life is narrow and few find it, whereas John 3:16 emphasizes belief in Jesus as the way to eternal life.
Matthew 7:14: Because strait [is] the gate, and narrow [is] the way, which leadeth unto life, and few there be that find it. [Because: or, How]
Contradiction with Romans 9:18
This verse states that God has mercy on whom he wills and hardens whom he wills, which could be seen as contradicting the universal offer of salvation in John 3:16.
Romans 9:18: Therefore hath he mercy on whom he will [have mercy], and whom he will he hardeneth.
Contradiction with Matthew 15:24
Jesus says he was sent only to the lost sheep of Israel, whereas John 3:16 suggests that God’s gift of salvation through Jesus is for all the world.
Matthew 15:24: But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Contradiction with John 6:44
This verse states that no one can come to Jesus unless the Father draws them, which can be seen as limiting the universal appeal of John 3:16.
John 6:44: No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.
Contradiction with Matthew 7:21
This suggests that merely calling on Jesus' name is not enough for salvation, differing from the emphasis on belief for eternal life in John 3:16.
Matthew 7:21: Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.