Contradiction with Acts 16:31
Acts 16:31 emphasizes belief in Jesus Christ for salvation, whereas Acts 19:4 highlights John's baptism of repentance and belief in the one who would come after him, Jesus Christ.
Acts 16:31: And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
Contradiction with Romans 10:9
Romans 10:9 specifies confessing and believing in Jesus for salvation, while Acts 19:4 mentions John's baptism and the anticipation of Jesus.
Romans 10:9: That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Contradiction with Galatians 3:27
Galatians 3:27 speaks about being baptized into Christ, in contrast to Acts 19:4 which refers to John's baptism of repentance.
Galatians 3:27: For as many of you as have been baptized into Christ have put on Christ.
Contradiction with John 1:12
John 1:12 states that believing in Jesus gives the right to become children of God, as opposed to Acts 19:4 which refers to a baptism unto repentance.
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: [power: or, the right, or, privilege]
Contradiction with 1 Corinthians 1:17
1 Corinthians 1:17 mentions preaching the gospel rather than focusing on baptism, which contrasts with Acts 19:4's emphasis on the baptism of John.
1 Corinthians 1:17: For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect. [words: or, speech]