Christ died for all, Not just the righteous!
1 Cor 15:22 22 For as in Adam all die, even so in Christ shall all be made alive. (KJV)
The all that made mankind sinners, is the same all, that through Christ shall all be made alive. When Christ died on the cross and was raised from the dead, He brought all mankind back into the presence of a just and loving God. What we do with this gift, will determine our status throughout eternity.
Christ's death on the cross gave all mankind life eternal. If we accept His gift of grace, we may spend our Eternal Life with Him. If we refuse to accept His gift of grace then we will spend our life eternal in Hell!
Joshua 14:15 -- choose you this day whom ye will serve; -- but as for me and my house, we will serve the Lord. (KJV)