From PCANET

"Ministers of the Word equip lay Christians to minister to one another in various other ways and with various gifts so that the whole church may be built up. Lay Christians may teach one another in an informal fashion and may exhort one another, but the work of preaching is reserved exclusively by God for those whom He has called and appointed as Ministers of the Word."

By this it appears they would reject having a class taught by a lay-person, as a class would be formal. A class on doctrine is hardly "informal".

Steve

Grace is not common.