Here "they were all" is a generalization, but it is possible that it refers to every person. AT: "but they were afraid of him" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
This is a way of saying he preached or taught the gospel message of Jesus Christ without fear. AT: "had openly preached the message about Jesus" (See: [[rc://en/ta/man/translate/figs-metonymy]])