Contradiction with Matthew 13:55
This verse refers to Jesus having brothers, which could be seen as conflicting if understood that James, the Lord's brother mentioned in Galatians 1:19, implies a different family relation.
Matthew 13:55: Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas?
Contradiction with Mark 6:3
Similar to Matthew 13:55, it mentions Jesus' brothers, suggesting a more literal familial interpretation, which might contradict interpretations of Galatians 1:19.
Mark 6:3: Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him. [offended: scandalized in, or, by him]
Contradiction with John 7:5
Indicates that Jesus' brothers did not believe in him at first, which could be conflicting if James is assumed to be a spiritual brother rather than a biological one as implied in Galatians 1:19.
John 7:5: For neither did his brethren believe in him.
Contradiction with Acts 9:26-27
Describes Paul meeting the apostles, but does not mention James, suggesting a possible contradiction in terms of who Paul reports seeing in Galatians 1:19.
Acts 9:26-27: And when Saul was come to Jerusalem, he assayed to join himself to the disciples: but they were all afraid of him, and believed not that he was a disciple.
Contradiction with Acts 15:13
James plays a prominent role in the Jerusalem council, which could be seen as contradicting the notion of him being merely "the Lord's brother" as it suggests a more significant role.
Acts 15:13: And after they had held their peace, James answered, saying, Men [and] brethren, hearken unto me:
Paradox #1
The potential contradiction or inconsistency related to Galatians 1:19 could be in identifying who James, "the Lord's brother," is. Some argue whether he was Jesus' biological brother, a close relative, or a spiritual brother. This can lead to debates about Jesus' family and the nature of early Christian communities.