Reason #5- The Book of Revelation was not written in the AD 90's but during the Reign of Nero in the late 60's AD (before the Fall of Jerusalem)!

We find a very clear indicator of the date of authorship in Revelation 17:10: "They are also seven kings. Five have fallen, one is, the other has not yet come; but when he does come, he must remain for only a little while" (Rev. 17:10).

"Five have fallen... "

Julius Caesar (49–44 BC)
Augustus (27 BC–AD 14)
Tiberius (AD 14–37)
Caligula (AD 37–41)
Claudius (AD 41–54)

"One is... " Nero (AD 54-68)

"the other has not yet come; but when he does come, he must remain for only a little while." Galba (June AD 68–January AD 69, a six-month rulership)