The statement "John Bunyan studied the Bible carefully after the Civil War," is true.
John Bunyan is known as an English writer and Puritan preacher best remembered as the author of the Christian allegory The Pilgrim's Progress. In addition to The Pilgrim's Progress, Bunyan wrote sixty titles, many of them expanded sermons. Bunyan came from the village of Elstow, near Bedford.
He is remembered in the Church of England with a Lesser Festival on 30 August, and on the liturgical calendar of the United States Episcopal Church on 29 August.