That God was reconciling the world to himself in Christ, not counting people's sins against them. And he has committed to us the message of reconciliation.
NIV
It was God [personally present] in Christ, reconciling and restoring the world to favor with Himself, not counting up and holding against [men] their trespasses [but cancelling them], and committing to us the message of reconciliation (of the restoration to favor).
AMP
To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
KJV
For if their rejection brought reconciliation to the world, what will their acceptance be but life from the dead?
NIV
For if their rejection and exclusion from the benefits of salvation were [overruled] for the reconciliation of a world to God, what will their acceptance and admission mean? [It will be nothing short of] life from the dead!
AMP
For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?
KJV