Ben Zobrist is now the utility man who plays second base for the Kansas City Royals. The night before he first left home to join the Astros’ affiliate in Troy, N.Y., he told his father, “I’m going to be a missionary in the big leagues.” And so he has been, whether by organizing Bible studies with teammates or vigorously supporting the career of his wife, Julianna, a Christian singer, or just in how he carries himself.