Contradiction with Genesis 3:19
This verse states that man will return to dust, implying mortality, which contrasts with the potential heavenly nature of man discussed in 1 Corinthians 15:48.
Genesis 3:19: In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou [art], and unto dust shalt thou return.
Contradiction with Ecclesiastes 3:20
It suggests that all go to the same place, which seems to conflict with the distinction between earthly and heavenly in 1 Corinthians 15:48.
Ecclesiastes 3:20: All go unto one place; all are of the dust, and all turn to dust again.
Contradiction with John 3:13
States that no one has ascended to heaven except Jesus, contradicting the idea of a heavenly man as suggested in 1 Corinthians 15:48.
John 3:13: And no man hath ascended up to heaven, but he that came down from heaven, [even] the Son of man which is in heaven.
Contradiction with Philippians 3:20-21
It implies that transformation into a heavenly state will occur in the future, while 1 Corinthians 15:48 suggests an existing heavenly nature.
Philippians 3:20-21: For our conversation is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ: [conversation...: or, we live or conduct ourselves as citizens of heaven, or, for obtaining heaven]