Isn't it part and parcel to presuppositional apologetics that knowledge is what can be deduced from prior true (in this case "presupposed") premises, and that we don't have to demonstrate the truth of the prior premises because this requires the "testimony of the Holy Spirit in the heart"?

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Davidius
Husband of Emilia
Member: First Reformed Presbyterian Church of Durham (RPCNA) - Durham, NC
Student: University of North Carolina at Chapel Hill, German Literature and Classics

This may explain the old adage about Baptists being Methodists with shoes, and Presbyterians being Baptists who can read. To round out the adage, Lutherans might qualify as Presbyterians who drink to excess, and Episcopalians as Lutherans who know when to say when. - D.G. Hart