Tradition suggests that the apostle John settled in Ephesus, and the seven churches to whom specific letters are given in Revelation were churches in the towns in the immediate vicinity of Ephesus, as well as Ephesus itself.

The book of Revelation only made it into the canon of Scripture by a small margin: there was some opposition for a long time, but it is now universally accepted. I'm curious to know why you assume you have the right to disdain it? Although it is widely acceptable to argue that Christianity means whatever I want it to, actually that's a totally incoherent position. Either it IS true that we will be judged for our sins, Jesus died to enable us to be forgiven and we have the possibility of everlasting life with God, or it's not. Given that we are all going to die, it's helpful to know what happens next...