Contradiction with Galatians 3:17
This verse suggests that the law, which came 430 years later, does not annul the covenant confirmed before by God in Christ, implying a continuity not based on ancestral promises alone.
Galatians 3:17: And this I say, [that] the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
Contradiction with Hebrews 8:13
This verse implies that the old covenant, which includes the promises to Abraham, is obsolete and replaced by a new covenant.
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.
Contradiction with Romans 4:13
This verse states that the promise to Abraham was not through the law but through the righteousness of faith, suggesting a basis beyond the ancestral covenant.
Romans 4:13: For the promise, that he should be the heir of the world, [was] not to Abraham, or to his seed, through the law, but through the righteousness of faith.