This book, together with his insistence on points of ritual in his cathedral church and his friendship with William Laud, exposed Cosin to the hostility of the Puritans; and the book was criticised by William Prynne and Henry Burton.
Gerard married firstly Mary, daughter of Sir John Brereton and secondly with whom he had no children, and secondly Mary, daughter of John Cosin, Bishop of Durham, with whom he had a daughter, Charlotte and a son and heir Sir Gilbert Cosins Gerard, 2nd Baronet.
When the Vice-Chancellor of the University, Dr John Cosin, is threatened with the loss of his position because of his supposed Catholic leanings (early 1641), the authorities begin to crack down on recusants, and three Catholic priests are arrested while giving mass.
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The original architect of the church is not known, but in 1663 the Yorkshire architect Robert Trollope was engaged to complete it, and it was consecrated on 5 July 1668 by John Cosin, Bishop of Durham.
St Edmund's church in Sedgefield is noted for its ornate 17th century Cosin woodwork, unique to County Durham: this is especially precious now that the display in Brancepeth has perished through fire.