All the world will know when Jesus returns.
Matthew 24:29-31 "“But immediately after the tribulation of those days THE SUN WILL BE DARKENED, AND THE MOON WILL NOT GIVE ITS LIGHT, AND THE STARS WILL FALL from the sky, and the powers of the heavens will be shaken. 30 “And then the sign of the Son of Man will appear in the sky, and then all the tribes of the earth will mourn, and they will see the SON OF MAN COMING ON THE CLOUDS OF THE SKY with power and great glory. 31 “And He will send forth His angels with A GREAT TRUMPET and THEY WILL GATHER TOGETHER His elect from the four winds, from one end of the sky to the other."
1 Thessalonians 4:16-18 "For the Lord Himself will descend from heaven with a shout, with the voice of the archangel and with the trumpet of God, and the dead in Christ will rise first. 17 Then we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air, and so we shall always be with the Lord. 18 Therefore comfort one another with these words."
Try reading the Bible.
Jesus won't exist in the new age but God's servant will be there in different flesh.
Isaiah 65
16: So that he who blesses himself in the land shall bless himself by the God of truth, and he who takes an oath in the land shall swear by the God of truth; because
the former troubles are forgotten and are hid from my eyes.
17: "For behold, I create new heavens and a new earth; and
the former things shall not be remembered or come into mind.
18: But be glad and rejoice for ever in that which I create; for behold, I create Jerusalem a rejoicing, and her people a joy.
19: I will rejoice in Jerusalem, and be glad in my people; no more shall be heard in it the sound of weeping and the cry of distress.
Zephaniah 3:
8: "Therefore wait for me," says the LORD, "for the day when I arise as a witness. For my decision is to gather nations, to assemble kingdoms, to pour out upon them my indignation, all the heat of my anger; for in the fire of my jealous wrath all the earth shall be consumed.
9: "Yea,
at that time I will change the speech of the peoples to a pure speech, that all of them may call on the name of the LORD and serve him with one accord.