This world is not going to be saved; it is coming to an END.
“For the wisdom of this world is foolishness with God” (1 Corinthians 3:19).
Jesus, the only begotten Son of God (John 3:16-18), says:
“For what shall it profit a man, if he shall gain the whole world, and lose his own soul? Or what shall a man give in exchange for his soul? Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels” (Mark 8:36-38).
“When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory; and before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats; and he shall set the sheep on his right hand, but the goats on the left. Then shall the King say unto them on his right hand, ‘Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world’” (Matthew 25:31–34).
“Then shall he say also unto them on the left hand, depart from me, ye cursed, into everlasting fire, prepared for the Devil and his angels. And these shall go away into everlasting punishment: but the righteous into life eternal” (Mathew 25:41, 46).
“He that is not with me is against me: and he that gathereth not with me scattereth” (Luke 11:23).
“He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the Last Day” (John 12:48).
“Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power” (1 Corinthians 15:24).
“He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the tree of life, which is in the midst of the paradise of God” (Revelation 2:7).