1Corinthians 15:28: Jehovah's Witnesses and the Trinity

When all things are knows underwent, then the Son himself be subject unto him that put all things, that God may be all in all. I believe in the trinity and I am sure you will be able to answer me by giving me the right meaning of this verse, because it has become the workhorse of Jehovah's Witnesses. Thank you.

When everything has been subjected to him, then the Son himself be subject unto him that put all things, that God may be all in all.

The expression "so that God may be all in all" means that after the Judgment everything will be submitted to the Father, man will no longer need a Messiah or a Redeemer (Jesus). All mankind will have been restored to the perfection that Adam originally enjoyed and there will be no more sins to forgive. This verse does not support the JW doctrine at all, indeed, it confirms the importance of the Redeemer and the three persons of the Trinity, each with a different task.