You're arguing against Malachi (and other scriptures) which clearly show that man is going to be burned up like stubble...into ash.
In addition you're advocating that man can have immortality without receiving the gift of immortality from Christ.
In addition Vine's Expository Dictionary says about oltethros says that it means "ruin, destroy, death, for the destruction of the flesh, said of the external ills and troubles by which the lusts of the flesh are subdued and destroyed"
In addition:
John 3:16 For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.
The word translated "perish" means absolute destruction, to destroy full, to kill.
Um, I didn't write 2 Thessalonians 1:9. Nor did I write Matthew 25:46
John 3:16 For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish (apollumi) but have everlasting life.
apollumi - From apo - from, away from
Perish "from, away from" God.