Contradiction with Jeremiah 31:37
Romans 11:1 states that God has not cast away His people, whereas Jeremiah 31:37 implies a condition under which God would cast off the seed of Israel if certain impossible things occur, suggesting a possibility of abandonment.
Jeremiah 31:37: Thus saith the LORD; If heaven above can be measured, and the foundations of the earth searched out beneath, I will also cast off all the seed of Israel for all that they have done, saith the LORD.
Contradiction with Matthew 21:43
Romans 11:1 asserts God has not rejected His people, whereas Matthew 21:43 states that the kingdom of God will be taken from Israel and given to a nation bringing forth its fruits.
Matthew 21:43: Therefore say I unto you, The kingdom of God shall be taken from you, and given to a nation bringing forth the fruits thereof.
Contradiction with 1 Samuel 15:26
Romans 11:1 emphasizes God’s enduring favor toward Israel, while in 1 Samuel 15:26, God rejects Saul from being king, illustrating an example of divine rejection.
1 Samuel 15:26: And Samuel said unto Saul, I will not return with thee: for thou hast rejected the word of the LORD, and the LORD hath rejected thee from being king over Israel.
Contradiction with Hebrews 8:13
Romans 11:1 speaks of God's continued acceptance of Israel, while Hebrews 8:13 suggests the old covenant (pertaining to Israel) is obsolete, hinting at a form of replacement or nullification.
Hebrews 8:13: In that he saith, A new [covenant], he hath made the first old. Now that which decayeth and waxeth old [is] ready to vanish away.