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.
They are very common in most cultures.
He was great, he really inspired the community.
giving sermons on a Friday afternoon is called a "khatib". 
The sermon or homily has been an important part of Christian services since Early Christianity, and remains prominent in both Roman Catholicism and Protestantism. Lay preachers sometimes figure in these traditions of worship, for example the Methodist local preachers, but in general preaching has usually been a function of the clergy. The Dominican Order is officially known as the "Order of Preachers" ("Ordo Praedicatorum" in Latin); friars of this order were trained to publicly
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