Contradiction with James 2:24
While John 20:31 emphasizes belief in Jesus for eternal life, James 2:24 highlights the necessity of works in addition to faith for justification.
James 2:24: Ye see then how that by works a man is justified, and not by faith only.
Contradiction with Matthew 7:21
John 20:31 focuses on belief for life, whereas Matthew 7:21 states not everyone who acknowledges Jesus will enter heaven, but those who do the will of the Father.
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.
Contradiction with John 6:44
John 20:31 suggests that belief in Jesus can lead to life, yet John 6:44 asserts no one can come to Jesus unless drawn by the Father, implying belief alone is insufficient.
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 19:17
John 20:31 promotes faith in Jesus for eternal life, while Matthew 19:17 suggests keeping commandments is necessary to enter life.
Matthew 19:17: And he said unto him, Why callest thou me good? [there is] none good but one, [that is], God: but if thou wilt enter into life, keep the commandments.
Contradiction with Hebrews 10:26
John 20:31 indicates belief leads to life, but Hebrews 10:26 warns that deliberate sinning after receiving knowledge of the truth results in judgment.
Hebrews 10:26: For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,