Can a Sunday school teacher or church officer be unsaved?
Yes. The context indicates that Sunday school teachers and church officers can be unsaved, as many who had been steeped in their particular background later wrote to say that for the first time in their lives they now knew what it was to have a real salvation.
Les explains that he takes the responsibility of teaching seriously, knowing he would have to answer if he misled someone to miss heaven's glory. He notes that people steeped in their particular background, including Sunday school teachers and church officers, have written to say that for the first time in their lives they now know what it is to have a real salvation. He sees this as evidence of God's approval on the ministry. He also states he would be scared to death of presenting an error, though he admits he is human and not above error, but he will not compromise the fundamentals: who Christ is, His virgin birth, His deity as Creator, His atoning work on the cross, His resurrection, and His coming again.