As the crowning act in the great drama of deception, Satan himself will appear as if he were Christ. The church has long looked for the Savior's coming as the fulfillment of her hopes. Now the great deceiver will make it appear that Christ has come. Satan will show himself as a majestic being of dazzling brightness, resembling the description of the Son of God in the book of Revelation (Revelation 1:13-15). LF 251.7
The glory that surrounds him is greater than anything that mortal eyes have yet seen. The shout of triumph rings out, “Christ has come!” The people bow down before him. He lifts up his hands and blesses them. His voice is soft, yet full of melody. In compassionate tones he presents some of the same heavenly truths the Savior spoke. He heals diseases, and then, in his assumed character of Christ, claims to have changed the Sabbath to Sunday. He declares that those who keep holy the seventh day are showing contempt for him. This is the strong, almost overpowering delusion. Vast numbers believe his sorceries, saying, This is “the great power of God” (Acts 8:10). LF 252.1