Contradiction with Isaiah 55:8-9
This suggests that God's ways and thoughts are higher than human understanding, contradicting the portrayal of a human, Jesus, having God's omniscience.
Isaiah 55:8-9: For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD.
Contradiction with Mark 13:32
Jesus admits that he does not know the day or hour of the end times, seemingly contradicting the idea of possessing full omniscience as suggested in John 1:48.
Mark 13:32: But of that day and [that] hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father.
Contradiction with John 5:19
Jesus states that he can only do what he sees the Father doing, implying limitations, which is at odds with the apparent omniscience in John 1:48.
John 5:19: Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise.