St Justin Martyr, Dialogue With Trypho the Jew on Circumcision and Jesus
When the debate begins, the first question Trypho asks is about circumcision, which was a major stumbling block for Christian converts in the early days of the Church, when many converts were confused on whether they first needed to convert to Judaism before becoming Christian. Converting to Judaism meant you had to be circumcised. St Paul in his Epistles famously reassures his Gentile converts that they only needed to be circumcised in their heart. Not only did Christian converts not need to be circumcised; it was wrong to require that converts be circumcised, and he is quite strident in his exhortations in Galatians in particular. […]