Read the entire chapter

All you have to do is to learn to read.  If you go to the beginning of the chapter, you will find Babylon which is referenced as "her" throughout the chapter.  Now, if it is Babylon who you wish to identify, that's not tough either.  Both Judaism and thus Christianity have taken significant portions of their belief systems from the Babylonians (as well as other nations including Persia and Egypt - Judaism is not monolithic), and have incorporated it into their beliefs.  Both Judaism and Christianity have killed a great many saints and prophets over the centuries - not just ancient Judaism or the medieval Catholic church, but the modern church as well.  The modern evangelicals are spiritually killing saints and prophets today - anyone who doesn't believe exactly as they do.

Revelation 18:1-2  After this I saw another angel coming down from heaven, having great authority; and the earth was made bright with his splendor. And he called out with a mighty voice,

"Fallen, fallen is Babylon the great!

It has become a dwelling place of demons,

a haunt of every foul spirit,

a haunt of every foul and hateful bird;