Our God, the living God of Israel, whose Divine Word became a man for us and for the whole human race, out of pure love, to save and to deify all souls that do not resist Him, can never be circumscribed by our thoughts or our beliefs, nor can the words even of Jesus be used by us to deny salvation to anyone, but only to extend it, graciously.
Our hope for the salvation of unbelievers is nothing compared to the mercy and love of God which our imaginary lines cannot restrain, for His Son came not to condemn the world, but to save it, and to bestow eternal life. Not everyone who believes is aware of their own faith, nor does everyone believe who says or thinks they do.
God is incapable of making a mistake. No one whose soul seeks Him, whether they know Him or not, is condemned, and no one is saved by no matter how much religious devotion, if all along they were seeking only themselves. God, not man, knows the difference, and infallibly.
All who have faith, wait. As for the others, let them judge, saved or condemned, to no avail. Only God is God, and only God is love.