Contradiction with Genesis 11:7-9
These verses describe the confounding of languages at Babel, contrasting with Romans 15:6 where unified glorification of God with one mind and mouth is emphasized.
Genesis 11:7-9: Go to, let us go down, and there confound their language, that they may not understand one another's speech.
Contradiction with Matthew 6:5
This verse highlights prayers made for show rather than unity and genuine glorification as encouraged in Romans 15:6.
Matthew 6:5: And when thou prayest, thou shalt not be as the hypocrites [are]: for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have their reward.
Contradiction with 1 Corinthians 1:10-11
Paul addresses divisions and lack of unity in the Corinthian church, which contradicts the unity and like-mindedness called for in Romans 15:6.
1 Corinthians 1:10-11: Now I beseech you, brethren, by the name of our Lord Jesus Christ, that ye all speak the same thing, and [that] there be no divisions among you; but [that] ye be perfectly joined together in the same mind and in the same judgment. [divisions: Gr. schisms]