These guys became preachers because it was a career path like nursing or counseling or sociology. They majored in it in college and seminary. It's a lot like history (that's the whole substance of the Harvard and Yale and other Ivy divinity schools). It is a clinical study of religion, as though religion were a sociological concept. Frikken cute.
There ought to be one requirement for the ministry. The indwelling of the Holy Spirit. Period.
Anyone that doesn't believe that isn't a believer.
Check this one out.