 Plantinga tried to throw doubt on this conjunction with a preliminary argument that the conjunction is probably false, and a main argument that it is self-defeating; if you believe it you should stop believing it.First, they criticised Plantinga's use of a Bayesian framework in which he arbitrarily assigned initial probabilities without empirical evidence, predetermining the outcome in favor of traditional theism, and described this as a recipe for replacing any non-deterministic theory in the natural sciences, so that for example a probable outcome predicted by quantum mechanics would be seen as the outcome of God's will.Plantinga's use of R to mean that "the great bulk" of our beliefs are true fails to deal with the cumulative effect of adding beliefs which have variable reliability about different subjects.