Born at Lewes, he was the son of Edward Snatt, minister and usher of the Southover free school there; in 1629 John Evelyn the diarist was a pupil.
A devout and consistent high churchman, Snatt resigned all his preferments rather than take the oaths to William III and Mary II.
These men had been found guilty of high treason in conspiring to assassinate William III.
This provoked a remonstrance from the two archbishops and ten bishops, and on 7 April the grand jury of Middlesex presented Snatt, Collier, and Cook for perpetrating a great affront to the government and a scandal to the church of England.
Collier absconded, and issued pamphlets in his defence; but Snatt and Cook were committed to Newgate Prison.