At present and especially in academia, there is widespread doubt and agnosticism with respect to the very existence of God. But if we don't know that… - Alvin Plantinga

I fully realize that the dreaded f-word will be trotted out to stigmatize any model of this kind. Before responding, however, we must first look into the use of this term 'fundamentalist'. On the most common contemporary academic use of the term, it is a term of abuse or disapprobation, rather like 'son of a bitch', more exactly 'sonovabitch', or perhaps still more exactly (at least according to those authorities who look to the Old West as normative on matters of pronunciation) 'sumbitch'. When the term is used in this way, no definition of it is ordinarily given. (If you called someone a sumbitch, would you feel obliged first to define the term?) Still, there is a bit more to the meaning of 'fundamentalist' (in this widely current use): it isn't simply a term of abuse. In addition to its emotive force, it does have some cognitive content, and ordinarily denotes relatively conservative theological views. That makes it more like <nowiki>'</nowiki>stupid sumbitch' (or maybe <nowiki>'</nowiki>fascist sumbitch'?) than 'sumbitch' simpliciter. It isn't exactly like that term either, however, because its cognitive content can expand and contract on demand; its content seems to depend on who is using it. In the mouths of certain liberal theologians, for example, it tends to denote any who accept traditional Christianity, including Augustine, Aquinas, Luther, Calvin, and Barth; in the mouths of devout secularists like Richard Dawkins or Daniel Dennett, it tends to denote anyone who believes there is such a person as God. The explanation is that the term has a certain indexical element: its cognitive content is given by the phrase 'considerably to the right, theologically speaking, of me and my enlightened friends.' The full meaning of the term, therefore (in this use), can be given by something like 'stupid sumbitch whose theological opinions are considerably to the right of mine'.

Aquinas believes that human beings (even in our earthly condition here below) can have knowledge, scientific knowledge of God's existence, as well as knowledge that he has such attributes as simplicity, eternità, immateriality, immutability, and the line. In Summa Theologiae Aquinas sets out his famous Five Ways or five proofs of God's existence: in Summa Contra Gentiles he sets out the proof from motion in much greater detail; and in each case he follows these alleged demonstrations with alleged demonstrations that God possesses the attributes just mentioned. So natural knowledge of God is possible. [...] So most of those who believe in God do so on faith. Fundamentally, for Aquinas, to accept a proposition on faith is to accept it on God's authority; faith is a manner of "believing God" (ST, IIa, IIae, ii, 2) "for that which is above reason we believe only because God has revealed it" (SCG, I, 9).

To show that there are natural processes that produce religious belief does nothing, so far, to discredit it; perhaps God designed us in such a way that it is by virtue of those processes that we come to have knowledge of him.