Paul uses a question to teach Timothy. Alternate translation: "he cannot take care of a church of God." or "he will not be able to lead a church of God." (See: [[rc://en/ta/man/jit/figs-rquestion]])
Here "church" refers to a local group of God's people. Alternate translation: "a group of God's people" or "the believers over whom he is in charge" (See: [[rc://en/ta/man/jit/figs-metonymy]])