I know everyone and their pet responded to you and I am going too

. The mark happened long ago, if you read the book in context you will see it is not to 21st century Christians but written to 1st Centruy Christians. None of that stuff will happen in the future the book of Revelations is highly symbolic. Now I don't trust Bill Gates enough that I don't even use windows on my Computer
You have that "it already happened" view. I believe the book of Revelations is a dual-meaning type book. Events similar to what is described in the book happened in the first century, but the ultimate end days are definitely what is also written in the book. Here are some reasons why I believe this:
1. We have not had 1000 years of peace on a new earth.
2. Satan is not locked up somewhere. He is here, running rampant.
3. Christians always face persecution, and it will be worse the closer we get to the end days.
4. People of the end times (now) will be as in the days of Noah. You can pretty much see us going in that direction when you look at what society says is now acceptable (that 20 years ago would not have been accepted) and also the way people are behaving.
5. The book says in the beginning (paraphrased) "This is what has happened, is happening, and will happen in the future." The events you think John wrote about happened before he was stranded on the island. How could it be a revelation about something that already happened, and how can he be envisioning things that already happened?
6. The books are clearly talking about the end times. Jesus says to his disciples what to look for when he is about to come back. John lived a few decades or so after them.
7. There are supposed to be birth pangs and then Jesus comes back. Do you think one day he's just going to pop up out of nowhere? No. We don't know the time He is coming back. However, events must take place before he comes back. The temple has to be rebuilt. It was already destroyed when John was writing the book.