The book of Revelation should frighten everyone who is not a true believer in Christ: But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death. (Revelation 21:8)
It is there as a warning to all those who do not obey the Gospel of our Lord Jesus Christ. Believing in Allah is not the same as believing on the Lord Jesus, who is the Savior of the world, and who died for your sins and rose again for your justification.