Imagine being in a city where you had to compromise the very crux of who you were just to make a living. You had to lay down your religion at every turn so much that it was just another thing that was no longer a staple in your every day life but yet you called yourself a Chrisitan. That's just a taste of what it meant to live in Thyatira.
Christ instructed John to write 7 letters to 7 churches. All of the churches have a specific message. Which church do you belong to?