The inhabitants of Planet earth are being prepared for the crowning act in the great drama of deception

As the crowning act in the great drama of deception, Satan himself will personate Christ. The church has long professed to look to the Saviour's advent as the consummation of her hopes. Now the great deceiver will make it appear that Christ has come. In different parts of the earth, Satan will manifest himself among men as a majestic being of dazzling brightness, resembling the description of the Son of God given by John in the Revelation. [REV. 1:13-15.] The glory that surrounds him is unsurpassed by anything that mortal eyes have yet beheld. The shout of triumph rings out upon the air., "Christ has come! Christ has come!" The people prostrate themselves in adoration before him, while he lifts up his hands, and pronounces a blessing upon them, as Christ blessed his disciples when he was upon the earth. His voice is soft and subdued, yet full of melody. In gentle, compassionate tones he presents some of the same gracious, heavenly truths which the Saviour uttered; he heals the diseases of the people, and then, in his assumed character of Christ, he claims to have changed the Sabbath to Sunday, and commands all to hallow the day which he has blessed. He declares that those who persist in keeping holy the seventh day are blaspheming his name by refusing to listen to his angels sent to them with light and truth. This is the strong, almost overmastering delusion. Like the Samaritans who were deceived by Simon Magus, the multitudes, from the least to the greatest, give heed to these sorceries, saying, This is "the great power of God." [ACTS. 8:10.]
But the people of God will not be misled. The teachings of this false christ are not in accordance with the Scriptures His blessing is pronounced upon the worshipers of the beast and his image,--the very class upon whom the Bible declares that God's unmingled wrath shall be poured out.
And, furthermore, Satan is not permitted to counterfeit the manner of Christ's advent. The Saviour has warned his people against deception upon this point, and has clearly foretold the manner of his second coming. "There shall arise false christs, and false prophets, and shall show great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect. . . . Wherefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, he is in the secret chambers; believe it not. For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be." [MATT. 24:24-27, 31, 25:31; REV. 1:7; 1 THESS. 4:16, 17.] This coming, there is no possibility of counterfeiting. It will be universally known--witnessed by the whole world.
Only those who have been diligent students of the Scriptures, and who have received the love of the truth, will be shielded from the powerful delusion that takes the world captive. By the Bible testimony these will detect the deceiver in his disguise. To all, the testing time will come. By the sifting of temptation, the genuine Christian will be revealed. Are the people of God now so firmly established upon his Word that they would not yield to the evidence of their senses? Would they, in such a crisis, cling to the Bible, and the Bible only? Satan will, if possible, prevent them from obtaining a preparation to stand in that day. He will so arrange affairs as to hedge up their way, entangle them with earthly treasures, cause them to carry a heavy, wearisome burden, that their hearts may be overcharged with the cares of this life, and the day of trial may come upon them as a thief.
source :{Great Controversy 625.2}
Ellen White