The Main Epistemological Question
For present purposes, perhaps the main epistemological question is this: what is the source of rationality, or warrant, or positive epistemic status, if any, enjoyed by religious belief? Is it of the same sort as that enjoyed by belief in the teachings of current science? Is the evidence, if any, for religious belief of the same sort as that for scientific beliefs? Or is there some special source of positive epistemic status for religious belief? This is really a contemporary version of a question that goes back a long way: the question about the relation between faith and reason. It is connected with the question whether there are cogent arguments (rational arguments, arguments drawn from the deliverances of reason) for theistic belief, and whether the existence of cogent argument is required for rational acceptance of religious belief.
evidentialism
Here there are fundamentally two views. According to ‘evidentialism’, the source of positive epistemic status for religious belief, if indeed it has such status, is just reason—the ensemble of rational faculties including, preeminently, perception, memory, rational intuition, testimony, and the like. The source of positive epistemic status for religious belief, therefore, is the same as that for scientific belief. This view goes back at least to John Locke (1689) and has prominent contemporary representatives. On this view, the existence of cogent arguments for a religious belief is required for rational acceptance of that belief, or at any rate is intimately related to rational acceptance. Some who endorse this view believe there aren't any such cogent arguments; accordingly they reject religious belief as unfounded and rationally unacceptable (Mackie 1982); others hold that in fact there are excellent arguments for theism and even for specifically Christian belief. Here the most prominent contemporary spokesperson would be Richard Swinburne, whose work over the last 30 years or so has resulted in the most powerful, complete and sophisticated development of natural theology the world has so far seen (see, e.g., Swinburne (1979, 2004), (1981, 2005))."non-evidentialism"
The other main view, one adopted by, for example, both Thomas Aquinas (Summa Theologiae) and John Calvin (1559), is that belief in God in the first place, and in the distinctive teachings of Christianity in the second, can be rationally accepted even if there are no cogent arguments for them from the deliverances of reason; they have a source of warrant or positive epistemic status independent of the deliverances of reason. This view also has prominent contemporary representation (Alston 1991; Plantinga and Wolterstorff 1984; Plantinga 2000). To use Calvin's terminology, there is the Sensus Divinitatis, which is a source of belief in God, and the Internal Testimony of the Holy Spirit, which is the source of belief in the distinctive doctrines of Christianity. Beliefs produced by these sources go beyond reason in the sense that the source of their warrant is not the deliverances of reason; of course it does not follow that such beliefs are irrational, or contrary to reason; nor does it follow that there is something especially dicey or insecure, or chancy about them, as if faith were necessarily blind or a leap in the dark. Indeed, John Calvin defines faith as “a firm and certain knowledge of God's benevolence towards us, … .” (Calvin, 1559, p. 551 (emphasis added)). On this view, religion and faith have a source of properly rational belief independent of reason and science; it would therefore be possible for religion and faith to correct as well as be corrected by science and reason.
There is some reason to think that if theism is indeed true, if indeed there is an all-powerful, all-knowing perfectly good person who has created the world and created human beings in his image, then religious belief would be independent of arguments from reason; it would not require such argument for rationality or positive epistemic status. For if theism is true, God would presumably want human beings to know of his presence (and in fact the vast majority of the human population believe in God or something very much like him); he would therefore arrange for human beings to be able to come to knowledge of him. But if knowledge of God depended on the theistic arguments, or other arguments from the deliverances of reason, then, as Aquinas says, only a few human beings would ever come to a knowledge of this truth, and they only after a long time, and with a substantial admixture of error.
I will post some more later.