1 Corinthians 15:17

and if Christ hath not been raised, your faith is vain; ye are yet in your sins.

'vain' -'not merely in the former sense (1 Corinthians 15:14) of being emptied of its content, but in the sense of its being futile, ineffectual.' (Erdman p. 158) 'Fruitless' (Vincent p. 275) 'Useless, idle, it gets you nothing.' (Lenski p. 655)

'ye are yet in your sins' -faith expressed in an "un-resurrected" Christ is futile. If Jesus failed to rise from the dead, then faith in Him is useless. No resurrection-no atonement for sin, no redemption, NO FORGIVENESS, YOU ARE STILL LOST! This verse implies that the resurrection PROVED THAT GOD ACCEPTED THE ATONEMENT AND SACRIFICE OFFERED BY JESUS FOR SIN.