Will Christians be able to identify the Antichrist before the rapture?
It is possible that Christians will be able to identify traits of the Antichrist but we cannot be sure of his actual identity. The Word of God says that the body of Christ is removed before the Antichrist signs the covenant of death (the false peace covenant with Israel) and that his true agenda will be hidden until the middle of the Tribulation when he is literally indwelt by Satan himself. No one can really be sure who that Antichrist is until the Jews sign the false peace treaty with him after the church is removed in the Rapture.
2 Thessalonians 2.7: "For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way." It is the church who must be taken out of the way before the Antichrist can rise up.