 In A Discourse on the Grounds and Reasons of the Christian Religion, 1724, Collins attacks the basis of Christianity as a revealed religion. In The Reasonableness of Christianity, Locke had made the messiahship of Christ the single fundamental tenet for being a Christian. In the Discourse Collins rejects it. The argument is that Christianity is founded on Judaism, or the New Testament on the Old. The New Testament is only of importance in this regard insofar as it shows that the prophecies of the Old are fulfilled. Collins rejects the claim that they are fulfilled in the New Testament. This, he asserts, is the only proof for Christianity. Collins’ critics disputed this claim; there was the proof from miracles. But Collins rejected such proofs.