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.
A Muslim preacher in general is referred to as a "dā‘ī" but I dont think they follow anything close to what christians do
He was a preacher for the Christian church.
The Dominican Order is officially known as the "Order of Preachers" they are the one of the oldest orders.
That is cool. I remember him talking about that once.
 The Franciscans are another important preaching order; But they are not very coomon anymore.