Resurrection or Immortality

Why are we to 'seek for immortality' if we are born immortal? Why will we 'put on immortality' if the only part of us that will ever be immortal has been immortal from birth (or before birth)? The fact that a person must 'seek for...immortality' and immortality must be 'put on' at the resurrection is conclusive proof that a person does not now have immortality, nor does a person have some immaterial, immortal something in them that cannot die. If Romans 2:7 and 1 Corinthians 15:53 teaches nothing more, it teaches that no part of a person now possess immortality. Not one passage in the Bible says anyone is now immortal; if no one is now immortal, no one can now have a soul that is now immortal. The immortal soul theology is from pagan philosophy, if all have a deathless soul, and we are told that this deathless soul is the only part of a person that will ever be immortal, and it is already immortal, the resurrection is made to be useless.