Jews, Judaism

Is the church lady present? “ Acts 13: 14, 43 - 52 14 but they passed on from Perga and came to Antioch of Pisid'ia. And on the sabbath day they went into the synagogue and sat down. 43 And when the meeting of the synagogue broke up, many Jews and devout converts to Judaism followed Paul and Barnabas, who spoke to them and urged them to continue in the grace of God. 44 The next sabbath almost the whole city gathered together to hear the word of God. 45 But when the Jews saw the multitudes, they were filled with jealousy, and contradicted what was spoken by Paul, and reviled him. This passage from ACTS was read at mass this morning.  Maybe because this time I was paying attention, but I was struck by the lingo.  "...many Jews and devout converts to Judaism followed Paul and Barnabas.." Am I reading this correctly? Isn't there a distinction made here between Jews and Judaism?  Was Judaism a term originally  applied to Jews who left in the schism that created the "Christian" sect?    My interest in this, here, is purely from the perspective of historical curiosity.  Anyone know? ”