For what it's worth to contribute to the conversation, in our church's membership class we note this:
WCF 1:4:
The authority of the Holy Scripture, for which it ought to be believed and obeyed, dependeth not upon the testimony of any man, or Church; but wholly upon God (who is truth itself) the author thereof: and therefore it is to be received because it is the Word of God.i
i2 Pet 1:19,21; 2 Tim 3:16; 1 John 5:9; 1 Thess 2:13.
Apologetic method, presuppositionalism: Bible is true because it is God’s Word. AUTHORITY OF SCRIPTURE. Self-authenticating authority. 2 Sam. 23:2, 2 Tim. 3:16-17, 2 Pet. 3:16. Also, “Thus saith the Lord”, “And the LORD said”, etc. As well the Church (as the RCC would boast) is not the source of authorizing the books of the Bible, but simply the testimony to them. Thomas Watson writes, “ … the church holds for the Scriptures [as the pillar and ground of the truth per 1 Tim. 3:15], but they do not receive their authority from the church, but from God.”
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My concern in observing my own apologetic efforts over the years is that I'd often walk way realizing I barely quoted any Scripture for the person to hear God directly as I'd get caught up in answering all the evidential arguments which won't save but only the Holy Spirit by the Word. Later on when I adjusted I'd challenge comments mostly with Scripture, and one friend (who had been a good Christian influence on me in high school but now sadly denies the faith due to evolution) said, "Wow, I've never had any Christian interact with me this way." Though he wasn't convinced then (only the Spirit of Christ can open one's eyes) I'd lean heavily on Romans 1:18-20 and say "you know this is true, even though you are denying it and I'm speaking to your conscience of what you know is true because the Bible says so and I'm bringing you directly to the Lord to hear His testimony directly in His Word." Acts 17:22-31 also comes often to mind, which uses cultural contact points but doesn't let God go under the microscope of skepticism of vain philosophy and science falsely so called. More and more I'm convicted less time needs to be given to proving the Word and much more time quoting the Word and praying for the soul hearing it to be enlightened by the Holy Spirit.
This said, I'm a "Clarkian" and he does recognize (in some writing somewhere?) that
reductio ad absurdum is a perfectly legitimate part of the witnessing project. I am of the opinion that the method of Scripture does matter to model as it also does with missions (I owe my thinking here to Prof. Steven F. Miller while at RPTS years ago--he is now with the Lord); here's a lecture I once gave on that overlapping topic reflecting his teaching and the required book for his class by John M.L. Young:
https://www.sermonaudio.com/sermoninfo.asp?SID=22012048456.