Because Muhammad clearly is NOT mentioned in the Bible if you reasearch it.
It is written:Mark 13:22 For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.
The Quran is nothing more than a travesty cunningly scripturalized by Satan and his 2 chief demons. The angel who supposedly appeared to Muhammad to deliver this so called message was nothing more than the chief demon called the False Prophet who was sent by his loser instructor Satan who goes to and fro the earth to deceive the whole world. And this False Prophet will be incarnated in the last days, and will be even MORE DECEIVING!!! Because he will have his 2 demons to act on behalf of each other.
Might I warn you that to those who reject the truth of Christianity will all fall victim to the Antichrist who will have them worship him as,"ALLAH"
It is written:Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as{Allah}God sitteth in the temple of God, shewing himself that he is God. Remember ye not, that, when I was yet with you, I told you these things? And now ye know what withholdeth that he might be revealed in his time. For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way. And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming: Even him, whose coming is after the working of Satan with all power and signs and lying wonders, And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. And for this cause God shall send them strong delusion, that they should believe a lie: 2 Thessalonians 2:1-11
God Bless!