It is implied here that the council members are talking about Jesus. AT: "What are we going to do about Jesus?" (See: [[rc://en/ta/man/translate/figs-explicit]])
# all will believe in him
The Jewish leaders were afraid that the people would try to make Jesus their king. AT: "everyone will trust in him and rebel against Rome" (See: [[rc://en/ta/man/translate/figs-explicit]])
# the Romans will come
This is a synecdoche for the Roman army. AT: "the Roman army will come" (See: [[rc://en/ta/man/translate/figs-synecdoche]])