Paul wanted to take Timothy along with him, so he circumcised him. He did so because all the Jews who lived in those places knew that Timothy's father was Greek.
Instead, we should write a letter telling them not to eat any food that is ritually unclean because it has been offered to idols; to keep themselves from sexual immorality; and not to eat any animal that has been strangled, or any blood.
While working with the Jews, I live like a Jew in order to win them; and even though I myself am not subject to the Law of Moses, I live as though I were when working with those who are, in order to win them.
For when we are in union with Christ Jesus, neither circumcision nor the lack of it makes any difference at all; what matters is faith that works through love.