How many Gentiles were saved at Cornelius's house and did they have to take on Judaism?
At Cornelius's house, the Gentiles saved were not hundreds; it was just a household. They were saved without any attending ramifications of Judaism. Peter later testified at the Jerusalem council that God had used him to speak to Gentiles, and the evidence showed they had been saved apart from the Jewish law.
Les explains that it had been 12 years since Peter had gone to the house of Cornelius. Peter had seen the amazing conversion of those pagan Romans, though there were not hundreds of them—it was just a household. Nevertheless, the evidence was there that they had been saved without any of the attending ramifications of Judaism or any of that. You would have thought Peter would have gone right back to Jerusalem and said the Gentiles are beginning to wake up, but he did not. Instead, he returned to Jerusalem and was called on the carpet for having gone to a Gentile, and there they stayed. Why? Because God had not yet permitted them to move any further than their ministry to the nation of Israel. At the Jerusalem council in Acts 15, when there was much disputing over whether Gentiles had to keep the Jewish law, Peter rose up and reminded them that God had used him to speak to Gentiles long ago, referring to Cornelius's house.