Replies (9)

Revelation 21:8 But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars—they will be consigned to the fiery lake of burning sulfur. This is the second death.” Non-believers, aka, non-Christians
Irenaeus affirmed around 120 ad that Revelation was Scripture. He was trained by Polycarp, who was a student of John of Patmos, who wrote it. Polycarp gave Irenaeus his info about the apostles, including what was considered Scripture by the early church. Revelation should be taken seriously as Scripture, though we can debate how exactly to read it.