Who is Pastor Spratt from Oranges Are Not the Only Fruit and what is their importance?

Pastor Spratt is the handsome young minister, who is leading a tent revival called a "crusade" when Jean's mother wanders in by mistake. She and many other young women accept the calling to Christianity that night. Pastor Spratt gives all new converts a potted plant, justifying his gift by saying that Christians are to be "fishers of men", and that it's okay to use "bait". Jean's mother chooses a Lily of the Valley.