Whether you are an atheist, agnostic, Christian or whatever, you presuppose you are able to understand – at least this sentence.
In Christian apologetics, there are two main schools: the evidentialists and the presuppositionalists. Both agree that God gave us a loaf and expects us to use it, for you can’t assent to something that has not initially passed through your loaf. . They disagree, however, on how we go about using it. The evidentialist says there are three stages in coming to faith in Christ: 1. Information (notitia) 2. Intellectual assent (assensus) and 3. Trust (fiducia). The presuppositionalist agrees that you need all three. The two schools differ in the following regard. I use a verse from scripture to illustrate:
1 John 5:20
And we know that the Son of God is come, and hath given us an understanding, that we know him who is true, even in his Son Jesus Christ. This is the true God, and eternal life.
The pesupposionalist says:
(Note: “This,” which begins the second sentence, refers grammatically to the immediate antecedent, namely, “his Son Jesus Christ.”
The reason we (Christians) understand his Son Jesus Christ to be the true God is because the Father decreed from eternity that we would understand it – providing us with the means of the three stages of notitia, assensus and fiducia.
How do I know that God decreed that some would use their loaf in the right way, how do I justify the presupposition that God decrees everything? You’re asking me to prove this presupposition. This presupposes that presuppositions can be proved. Atheists presuppose the “laws” of nature because, they say, THAT is the way nature has evolved; I presuppose the God of the Bible because the Bible says THAT is the way I was created.
I am debtor both to Greeks and to Barbarians, both to the wise and to the foolish. 15 So, as much as in me is, I am ready to preach the gospel to you also that are in Rome.
16 For I am not ashamed of the gospel: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek. 17 For therein is revealed a righteousness of God from faith unto faith: as it is written, But the righteous shall live by faith.
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hinder the truth in unrighteousness; 19 because that which is known of God is manifest in them; for God manifested it unto them. 20 For the invisible things of him since the creation of the world are clearly seen, being perceived through the things that are made, even his everlasting power and divinity; that they may be without excuse: 21 because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.
To put it gently, reject Romans 1, you’re toast.