Revelation 13:7

And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations.

The church of Satan will be given power to make war with the saints, and to overcome them. John later saw the church of Satan drunken with the blood of the saints: “And I saw the woman drunken with the blood of the saints, and with the blood of the martyrs of Jesus: and when I saw her, I wondered with great admiration.” (Revelation 17:6) The saints who will be killed by the church of Satan were previously revealed in the opening of the fifth seal: “And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: 10And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? 11And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellow servants also and their brethren, that should be killed as they were, should be fulfilled.” (Revelation 6:9-11)

The church of Satan will be given power over the whole world.