The starting point for the Christian worldview is always the scriptures, but if you listen to Christians attempting to defend the Christian faith, they seldom start with the Scriptures. Instead they feel it is necessary to “put themselves in the mind of the unbeliever” in order to establish a “common ground” to have sound discourse with them. When this approach is utilized the battle is over.
Why would the battle be over with defending the Christian faith with this approach? The moment the Christian concedes(Even just for the sake of argument) they have already agreed that there is a possibility that God and the Bible may not be true. The Scriptures never grant the Christian such liberty. Let’s look at the verse below and see if we can apply it to our example above:
(ESV) John 8:24: “I told you that you would die in your sins, for unless you believe that I am he you will die in your sins.”
Jesus was speaking to the Jewish religious leaders and you say he was engaged in an apologetic for the faith. He does not once concede and say, “OK, let’s just for sake of the argument I”m not who I say I am, namely the Son of God, who takes away the sins of the world…?” No, this is never once entertained, but the unbelieving leaders are forced to either accept His testimony and therefore to believe that he is the promised Messiah or they will perish in their sins. There is zero room for neutrality. And this is the point; to concede to the unbelievers position is to believe that God is neutral and we not from the Scriptures that this is not the cause. The Lords judgements are binary; we are either covenant keepers or covenant breakers. Saints or reprobates.
So this is why the presuppositional method of apologetics is the most faithful defense of the Christian faith to the scriptures. We have committed our way to the King of Kings and as Christ said in Matthew 12:30, “Whoever is not with me is against me, and whoever does not gather with me scatters.”