They can do this because a person is not a true Jew if he is only a Jew in his physical body; true circumcision is not only on the outside of the body.
My brothers and sisters, God called you to be free, but do not use your freedom as an excuse to do what pleases your sinful self. Serve each other with love.
In the end, they will be destroyed. They do whatever their bodies want, they are proud of their shameful acts, and they think only about earthly things.
We are the ones who are truly circumcised. We worship God through his Spirit, and our pride is in Christ Jesus. We do not put trust in ourselves or anything we can do,
They say they know God, but their actions show they do not accept him. They are hateful people, they refuse to obey, and they are useless for doing anything good.
Some people have secretly entered your group. Long ago the prophets wrote about these people who will be judged guilty. They are against God and have changed the grace of our God into a reason for sexual sin. They also refuse to accept Jesus Christ, our only Master and Lord.
I know your troubles and that you are poor, but really you are rich! I know the bad things some people say about you. They say they are Jews, but they are not true Jews. They are a synagogue that belongs to Satan.
But cowards, those who refuse to believe, who do evil things, who kill, who sin sexually, who do evil magic, who worship idols, and who tell lies—all these will have a place in the lake of burning sulfur. This is the second death.”
Those in the synagogue that belongs to Satan say they are Jews, but they are not true Jews; they are liars. I will make them come before you and bow at your feet, and they will know that I have loved you.