layman

lay|man /l'eɪmən/ (laymen)
1 [N-COUNT]
A layman is a person who is not trained, qualified, or experienced in a particular subject or activity.
The mere mention of the words `heart failure', can conjure up, to the layman, the prospect of imminent death...
expert
2 [N-COUNT]
A layman is a man who is involved with the Christian church but is not a member of the clergy or a monk.
In 1932, one Boston layman wrote to Archbishop William O'Connell in support of Father Coughlin.