Why does every Gentile individual need to ask what they must do to be saved?
God does not deal with Gentiles on a covenant or national basis, as He did with Israel. Instead, He deals with Gentiles as individuals. Consequently, every Gentile must personally ask what he or she must do to be saved, just as the pagan jailer asked Paul and Silas.
Les explains that when Peter preaches in Acts 2, he is dealing with the covenant nation of Israel, which speaks from the national standpoint and asks, "What must we, the nation, do?" But God does not deal with Gentiles on covenants. He deals with Gentiles as individuals, so every individual has to ask that same question. In Acts 16, the pagan Gentile jailer was sovereignly made to know that Paul and Silas had the answer to his dilemma. He came trembling, fell down before them, and asked, "Sirs, what must I do to be saved?" The issue was not just his prisoners but his own soul.