Committing suicide, when one is facing an assassination, is not the same as being "slain", and Nero did not rule for 42 months (Revelation 13:5), but more like 14 years. As for the details of Nero burning down Rome, those treatises were written way past the throw away date, by non observers, and have been largely debunked. He actually personally helped organize the fighting of the fire, and was instrumental in having new fire proofing building codes. The culprit was more likely in the vein of Mrs. O'leary's cow kicking over the lamp. And definitely, Nero did not "deceive" those who dwell on the earth" (Revelation 13:11-14). That was done be "another" king/beast (Revelation 13:11), the Emperor Constantine, who instituted your Roman church, built upon the foundation of the "two horns like a lamb", Peter, the "worthless shepherd" of Zechariah 11:17, and Paul, the man of lawlessness, who was to break the covenant with the peoples (Zechariah 11:10). You are confusing "Christians"/Gentiles, the followers of Paul, with "my sheep". As for Rome, Caesar still exists in the modern world via the Czars of Russia, and their successor, the dictator of the democratic Russia, Putin, and the Kaisers of Germany, in their successor the democratic chosen dictator of Germany, known as Chancellor Angela Merkel.
69 AD Nero's Death | Historia Timelines
The summation of the book of Revelation is in Revelation 19:13-15, whereas the "Word of God" will "smite the nations", and "rule them with a rod of iron". That has yet to happen. The only thing that has happened concerning the here and now, is that "those who dwell on the earth" have been "deceived" (Revelation 13:14).