You do not think there are two real prophets that send plagues on the earth to get it to repent before Jesus returns? What do you suppose that refers to?
You can never be too certain with Revelation, because as being mentioned, it is an apocalyptic book. Its purpose is mainly to encourage Christian to resist staunchly the demands of emperors worship. That the showdown between God and Satan is eminent. Satan will increase his persecution of believers, but they must stand fast, even to death. They will be sealed against any spiritual harm and will soon be vindicated when Christ returns, when the wicked are forever destroyed, and when God’s people enter an eternity of glory and blessedness.
The verses you quoted are generally understood about witnesses model after Moses and Elijah testifying in the final period before Christ returns.
However this exclude Mohammad as Mohammad already mentioned that Jesus did not die on the cross. Jesus definitely affirmed his death on the cross in the following verses.
Also, any other prophets were not necessary as now he sent the disciples with the power of the Holy Spirit to be his witnesses.
**Lk 24
46He told them, “This is what is written: The Christ will suffer and rise from the dead on the third day, 47and repentance and forgiveness of sins will be preached in his name to all nations, beginning at Jerusalem. 48You are witnesses of these things. 49I am going to send you what my Father has promised; but stay in the city until you have been clothed with power from on high.”
Act1
6So when they met together, they asked him, “Lord, are you at this time going to restore the kingdom to Israel?”
7He said to them: “It is not for you to know the times or dates the Father has set by his own authority. 8But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”
9After he said this, he was taken up before their very eyes, and a cloud hid him from their sight. **
Moreover, this episode was after the resurrection, further confirming the contradiction of Mohammad’s version when he said that Jesus did not die.