The Antichrist is a future figure who will oppose Christ, deceive many, and demand worship. He's associated with 'the man of lawlessness' (2 Thessalonians 2) and 'the beast' (Revelation 13). John also uses 'antichrist' for anyone denying Christ (1 John 2:18). He will be defeated at Christ's return.
“Children, it is the last hour, and as you have heard that antichrist is coming, so now many antichrists have come.”
- 1 John 2:18
The mark of the beast (Revelation 13:16-18) is a mark required by the Antichrist to buy or sell, associated with the number 666. It symbolizes allegiance to the beast and rejection of God. Christians debate whether it's literal or symbolic, but all agree it represents ultimate opposition to Christ and loyalty to evil.
Revelation is apocalyptic prophecy revealing Jesus Christ's ultimate victory over evil. It contains visions given to John about churches, God's throne, judgments, the fall of Babylon, Christ's return, Satan's defeat, final judgment, and the new heaven and earth. Its message: God wins, so persevere faithfully.
The Second Coming is Jesus' promised return to earth in glory to judge the living and dead and establish His eternal kingdom. Unlike His first coming as a humble servant, He will return as conquering King. Every eye will see Him (Revelation 1:7). No one knows the exact timing except the Father.
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Answers are informed by Scripture and trusted theologians including Matthew Henry, John Calvin, and John Wesley. Always verify with Scripture and consult your local church for pastoral guidance.