The Bible is very clear that when Jesus comes back, His feet never touch the ground. For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be. Satan cannot replicate a worldwide, cataclysmic event the magnitude of the real second coming. But if he can seduce Christians into believing the secret rapture theory, he won't have to. He can simply show up around the world in various places, perform great miracles, make TV appearances, and thereby deceive the entire world.
Every general knows that the key to victory in battle is to maintain an element of surprise.
Many battles have been won because of a clever diversionary tactic. While one army was distracted and looking at the diversion, the enemy came up from behind to conquer them. In the devil's final assault, he will do the same thing. The archdeceiver has always wanted to be God. Now he knows that he is doomed, but his last taunting gesture against heaven will be to personate Jesus and receive the worship of a lost world.