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Romans Chapter 1:18-20 states:

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The wrath of God is being revealed from heaven against all the godlessness and wickedness of men who suppress the truth by their wickedness, since what may be known about God is plain to them, because God has made it plain to them. For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that men are without excuse.

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   This is stating unequivocally, that no person has an excuse because everybody knows that God exists.

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   One of the most powerful aspects of Pre-Suppositional Apologetics is appreciated from a positional standpoint.¹

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For more use the DOOR.

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   [MORE]

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   [The following continues the above…]

   When we engage critics with evidence-based research, we accept their premise that they genuinely do not believe in God, and we give up our position of arguing from our authority, which is the Bible. Regrettably, when we put our Bible down in order to engage them on “neutral ground” we have already lost.  Why?  Because “neutral ground” is a secular concept.  It is therefore not neutral. 

   However, as we read in 1 Peter 3:15:

   But in your hearts set apart Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do    this with gentleness and respect

   What is the very first thing we are to do which precedes even being prepared to give an answer? “But in your hearts set apart Christ as Lord.”

   In other words, the Biblical way to defend the faith is to begin by standing on the authority of Jesus Christ and the truth of God’s Word. Not to abandon our moorings upon engagement.  The final authority to the unbeliever, when you strip it all down, is their trust in their ability to reason. Our final authority is the Bible. However, unbelievers try to get us to abandon our final authority by claiming, “Since I don’t believe in the Bible, you can’t use it to substantiate your beliefs or points.” It is important for us to understand that if we are going to accept the false premises of the challengers to the faith and give up the ground established by our authority, the Word of God, then no matter what or how we argue, the skeptics win. I think of it as getting on the Atheist’s Airplane. Once you board the Atheist’s Airplane, it does not matter what you discuss in flight, you are going to land at the Atheist’s Airport.

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   [This is a "middle" section--cited verbatim--of a longer article from the source below. We've added color and boldface.]

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   ¹From https://sepetjian.wordpress.com/2012/03/19/be-prepared-an-introduction-to-pre-suppositional-apologetics, found at the Ravi Zacharias website along with, we feel, other very helpful and responsible information.