[CynicalBear]

When Paul and Silas were asked by the jailor “what must I do to be saved” did they leave off some things? Did they forget to tell him that they needed to belong to a specific legally organized church? Did they forget to tell him that he needed to learn the Catholic church catechism?

[Cronos]

Do read the entire verse which goes

31 They replied, “Believe in the Lord Jesus, and you will be saved—you and your household.” 32 Then they spoke the word of the Lord to him and to all the others in his house. 33 At that hour of the night the jailer took them and washed their wounds; then immediately he and all his household were baptized

Key point -- he had to believe that Jesus Christ was Lord and God and Savior and had to be baptised in the Name of the Father, Son and Holy Spirit. THAT is the basis of faith and the basic definition of a Christian