The Book of Revelation is an apocalyptic work written by a Christian prophet identified simply as God's servant John. It probably reflects the persecution of Christians under Nero. Rome is identified as Babylon, a fitting comparison, since both nations destroyed the temple and Jerusalem. Caesar is 666. The message tells Christians how to live in a hostile society.
Christians are to avoid worshipping political power and making it a god.
We are to oppose oppressive governments. Indeed God in Christ has already conquered evil. This is the reason we read this book during the Easter season.