Christians were persecuted in Jerusalem, beginning with the stoning of Stephen. “Saul laid waste the church, and entering house after house, he dragged off men and women and committed them to prison.” (Acts 8:1,3).
Shortly thereafter, “Saul, still breathing threats and murder against the disciples of the Lord, went to the high priest and asked him for letters to the synagogues at Damascus, so that if he found any belonging to the Way, men or women, he might bring them bound to Jerusalem.” (Acts 9:1-2)
Because they were persecuted, Christians could not go to synagogues on the Sabbath if they were known to be Christians, so they met in each others’ homes on the first day of the week.
After his conversion, Paul (Saul) taught in synagogues on the Sabbath, but time after time, he was driven out under threat of death.
Good luck.