Contradiction with Matthew 15:24
Jesus' statement about being sent only to the lost sheep of Israel contradicts the inclusion of Gentiles in salvation as described in Ephesians 3:6.
Matthew 15:24: But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Contradiction with Acts 10:28
Peter's acknowledgment of Jewish law forbidding association with Gentiles contradicts the notion of their equal inclusion in Ephesians 3:6.
Acts 10:28: And he said unto them, Ye know how that it is an unlawful thing for a man that is a Jew to keep company, or come unto one of another nation; but God hath shewed me that I should not call any man common or unclean.
Contradiction with Deuteronomy 7:6
The idea of Israel as a chosen, special people contradicts the equal standing of Gentiles in the promises of Ephesians 3:6.
Deuteronomy 7:6: For thou [art] an holy people unto the LORD thy God: the LORD thy God hath chosen thee to be a special people unto himself, above all people that [are] upon the face of the earth.
Contradiction with Matthew 10:5-6
Jesus instructing the apostles to avoid Gentile regions contradicts the message of Gentile inclusion found in Ephesians 3:6.
Matthew 10:5-6: These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into [any] city of the Samaritans enter ye not:
Paradox #1
Ephesians 3:6 talks about the inclusion of non-Jews (Gentiles) in God's promises, alongside Jews, through Jesus Christ. A potential theological conflict could arise with views that traditionally saw God's promises as exclusive to Jews. This inclusivity might contradict interpretations that perceive a clear division between Jews and Gentiles in terms of spiritual inheritance before Christ's intervention.