as to that last psg: I have seen evil people do "great... wonders" and get away with it. Hillary Clinton comes to mind. Now, I don't know if that is exactly what Jesus was talking about but the world in general seems to think people like the Clintons are gods, all that money, getting away with so many crimes. I don't know if I understand what Mt 24:24 means but I do know about the elect being (if possible) deceived. It is easy to believe soemthing when "everyone else" believes it, hard to go against the grain of society, or even the Church so called. We know the Church goes against society (or... used to) and Christians accept they will not be popular w/ the world. But now what do we do? what do we do now that the Church itself is--- well, you know-- you traditionalists and sedavacantists know
Matthew 24:24 is referring to those who purport to be Christian or Christian leaders. They say some orthodox things and mix in some poison like every cunning heretic in history. Their heresies are very convincing, maybe because of their words or simply because of whom it's appearing to be coming from (antipope). The elect will not be deceived because they know the Teachings of Christ as defined and taught by the Magisterium. Those who don't will be easily deceived.
You are correct that it's easy to believe something that everyone else believes, but that's only if you don't know the truth. The truth is out there and only found in the Catholic Church. A Catholic needs to learn their faith. As GJC said, one also needs to pray the Rosary. If your intent is honest, the Lord will grant the graces necessary to lift the blindness that covers so many. Always remember that the Catholic faith is necessary for salvation. The V2 sect is not the Catholic Church nor is their hierarchy Catholic.