Major, the words you quote are only in regard to those who "received not the love of the truth" by the time when there will be signs and wonders:Indeed they do but you are not understanding them I think.
My friend......that clearly says that there will be people who heard and rejected and by that action will be damed.
IMO , anyone who rejects the gospel today can not be saved after the Rapture.
"Even him, whose coming is after the working of Satan with all power and signs and lying wonders. And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie: That they all might be damned who believed not the truth, but had pleasure in unrighteousness" (2 Thess.2:9-12).
It is only those who believe not at the time when mankind will be deceived by the signs and lying wonders who are in view:
"And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live...And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name" (Rev.13:14).
We can see that there will be believers at this time because there will be some who do not receive the mark:
"And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years" (Rev.13:16-17).
Therefore, there will be plenty of time for people to come to the knowledge of the truth and be saved before the signs and lying wonders will deceive mankind.