What is the reason God allowed Satan to survive for thousands of years after his rebellion? Why didn’t He just destroy him and his followers immediately? After all- we know they will all be destroyed (sent to Hell – the burning lake of fire) eventually (I think very soon). Can you imagine what life would have been like without Satan’s influence. Probably much like Heaven. Also, will unsaved people go to “the lake of fire” or do you think most go to “outer darkness” and suffer mainly the absence of God forever?
The answer to your question is not given in the Bible, but don’t get the idea that without Satan in the world we’d be living in a kind of heaven on Earth. Man has clearly demonstrated his propensity for sin in the past, and remember Satan will be bound through out the 1000 years of the Millennium. Yet natural man will still sin, requiring daily sin offerings in the Millennial Temple (Ezek. 46:13), and as soon as Satan is released will rebel again. (Rev. 20:7-10) So much for man being good when Satan’s not around.
Rev. 20:15 says that anyone whose name is not found written in the Book of Life will be thrown into the Lake of Fire.