Why was there an uproar at the Jerusalem council over preaching to Gentiles?

Les explains that the Jerusalem council had called Paul up to answer these things. The Jews were jealous of their relationship with Jehovah, and they could not reconcile taking the message to Gentiles. Peter came to Paul's defense, recalling how God had sent him to the house of Cornelius and opened his eyes to the fact that God could save Gentiles without their becoming proselytes of Judaism. In Acts 15:12, after the uproar, the multitude kept silence and listened to Barnabas and Paul declaring what miracles and wonders God had wrought among the Gentiles. Les often says God does everything sovereignly; had Peter not had that eye-opening experience, Paul would never have gotten off the hook, and Christianity would never have gotten off the ground. God had opened Peter's eyes 12 years earlier that Gentiles could be saved by simply believing.