Most churches tend to either preach from the letters of Paul, acts and do not tend to touch the Torah or the old testament prophets
Jer 5:31 The prophets prophesy falsely, and the priests bear rule by their means; and my people love to have it so: and what will ye do in the end thereof?
The tendency to preach from what one knows going through the book of ezekial or maybe the book of Deuteronomy or Leviticus in church is almost unheard of as it does happen
So many preachers have preached though Romans but few through books like Obadiah
