He was, however, persuaded by his friend Henry Dodwell's argument, in The Case in View, that the schism would end with the death of the last invalidly deprived bishop who continued to insist on his right, and he therefore returned to his parish church—St Peter in the East, Oxford—after the death of William Lloyd (bishop of Norwich).
He was responsible from 1708 to 1710 for a monthly periodical entitled Censura temporum, or Good and Ill Tendencies of Books,.
[1] This was a book review in dialogue form which upheld orthodoxy and the Church of England against the anti-trinitarian religious ideas of William Whiston and the political notions of John Locke.
Parker's chef d'ouvre was Bibliotheca Biblica (collected in 5 vols., 1720–1735), a massive compilation of patristic commentary on the Bible, issued in monthly installments beginning in 1717 and funded via subscription.
His second son, Sackville, was a well-known Oxford bookseller who kept a shop in the High Street at the corner of Logic Lane and was a friend of Samuel Johnson.
His third son, Richard, attended Lincoln College, Oxford, on a scholarship, but left without a degree on account of the oaths and later helped his father prepare the Bibliotheca Biblica.