>> “The Rapture of the Church will only be “seen” by the entire world in that they will have noticed many missing persons gone from the earth in the blink of an eye.” <<
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Not so!
It will be the most visible event that the world has ever seen.
Millions of Yeshua’s sheep rising up to meet him and his angels in the air will fill the skies of the entire world.
Yeshua described it as lightning visible from the east to the west. He said that if someone told you that it would be in a secret place, believe them not.
We disagree but it is not salvation-threatening.
That’s at the end of the tribulation when He comes to defeat the armies at Armageddon. That is not at the rapture. In the rapture we meet Him in the air.
1 Thessalonians 4:16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: 17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
His feet never touch the earth like they will in His return to set up the millennium. At the end of the Tribulation we come back with Him.
Jude 1:14 And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the Lord cometh with ten thousands of his saints,
I don’t know what organization or entity your getting you information from regarding the end times but it certainly doesn’t line up with scripture.