Contradiction with John 1:21
John denies being the prophesied prophet, which contrasts with Luke 1:76's prophecy about John's role.
John 1:21: And they asked him, What then? Art thou Elias? And he saith, I am not. Art thou that prophet? And he answered, No. [that prophet: or, a prophet?]
Contradiction with John 3:28
John states he is not the Christ or the main figure, contrasting with the prominence given in Luke 1:76.
John 3:28: Ye yourselves bear me witness, that I said, I am not the Christ, but that I am sent before him.
Contradiction with Matthew 11:11
Claims no one born of women is greater than John, yet Luke 1:76 only presents him as a prophet.
Matthew 11:11: Verily I say unto you, Among them that are born of women there hath not risen a greater than John the Baptist: notwithstanding he that is least in the kingdom of heaven is greater than he.