Didn't summarize the first 5 chapters because they
introduce John and the importance of the 7 churches
of Asia minor receiving this message.

It is dictated to him by Jesus.

Many say the reason why the churches aren't mentioned
after chapter 5, is the church is raptured.

I'm not sure I agree with that assessment.

But would like to talk about the various churches
that existed at the time, and in many cases symbolize
the churches of today.

One easily recognized is the laodicean church - where
Jesus states it is neither hot or cold and he
could spew it out of his mouth. Pretty strong
words.