To where? ... Christ is returning to this earth ... to set things 'right'... Matthew 24: Mark 13: and Luke 21 are the Words Christ gave to describe the 'signs' prior to His return ... Might call them a description of the Seals/Trumps/Vials of the book of Revelation... Christ gives not even the slightest hint He will be returning to zip anyone off this earth and then return again... it simply is not there there.
Christ says the 'first' tribulation, (the rapture doctrine teaches some will be spared), is mass deception ... taking the 'mark' is what the many will do believing they are following Jesus... because they have not 'read' with understanding the actual Words of Christ.
I guess you missed the huge clue JESUS gave us that He is coming in the air to take us to The Father’s House (John 14). You can find that clue in Revelation 5, where the Redeemed (that’s all who have God’s seed abiding in their spirit -1 John 3:9) where the redeemed are witnesses to the opening of the seven sealed scroll, which means we are in Heaven BEFORE the Tribulation starts! Since your ORG religion does not want you believing in the Pre Tribulation Departure to the Father’s House, it is understandable that such a huge clue would zoom right over your Catholic head.
You would do well to read the #43 post of metmom’s excellent explanation regarding the blood.