There was a similarity between the wrong practices in Pergamum and in Thyatira, which was that false teachers were advocating participation in pagan temple practices. The difference between the two churches is that the sinful teaching in Thyatira came from a woman who claimed to be a prophetess. She is called Jezebel, the name of the pagan queen in the Old Testament who opposed the true worship of God.
Her influence had divided the church, with some tolerating her ideas and others opposing them. She managed to convince some of the believers to adopt her instructions. We can see that they were true believers because Jesus calls them ‘my servants’. Of course, this is a reminder that sometimes true Christians can be led astray.
Initially, the Lord had shown patience with her, giving her time to repent. Probably, the patience had been expressed through others attempting to correct her. Whatever the approach, she had refused to change her instructions. The outcome would be severe punishment. She would become ill and those who joined her in attendance at pagan temples would find trouble. Jesus mentions his use of power when he says that he will throw her and them into locations of trouble. When he says that her children will be killed, he means that her followers will die, and her movement come to an end.
The outcome would be a discovery for other churches. They would realise that Jesus can read the secrets of each heart, which means he knows the motives behind the actions of every person. Moreover, they would learn that Jesus will judge those who try and blend together pagan religion and Christianity.