That is correct, they were not Christians but Catholics, who actually defy the laws of Christianity, they have killed many Christians because they would not cow down to their false teachings.

First of all, Those are NOT Christians pictured there, they are Catholics, and it is no surprise when you consider their role in the killing of Christians in the first few centuries to try and establish their doctrines and abolish Christs. Today's Catholic example shows they are not Christian now either. Christians are followers of Christ. These are false teachers.