My father was a preacher.
A preacher is usually a person who delivers sermons  sometimes they call them fathers.
Yes, he did it every Sunday.
Preacher
A preacher is a person who delivers sermons or homilies on religious topics to an assembly of people. Less common are preachers who preach on the street, or those whose message is not necessarily religious, but who preach components such as a moral or social worldview or philosophy.
History.
Preachers are common throughout most cultures. They can take the form of a Christian minister on a Sunday morning, or an Islamic Imam. A Muslim preacher in general is referred to as a "dā‘ī", while one
don't have prejudice against meself. My father was a white and my mother was black. Them call me half-caste or whatever. Me don't dip on nobody's side. Me don't dip on the black man's side nor the white man's side. Me dip on God's side, the one who create me and cause me to come from black and white."
Marley’s journey to become a member of the Rastafari movement is documented in the film starting with his friendship with Rastafari preacher