Therein, it seems, lies the problem. The Bible presents a pretty grim view of the thinking processes of Natural Man. I've already beat to death (perhaps) the claim that "Natural Man does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned" (1 Cor 2:14). That doesn't bode well for the logical discussion of the truth. And it only gets worse from there. Paul says "the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ" (2 Cor 4:4). That's Man's natural condition -- blinded minds. In his explanation of the Gospel, Paul tells the problem that the Gospel addresses: "The wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth" (Rom 1:18). The "bad news" that the "good news" addresses is that Man is under wrath. Why? Because he has decided that unrighteousness is preferable to righteousness and, to maintain that unrighteousness, he must suppress the truth. The effect of this little piece of insanity is cumulative.
For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Claiming to be wise, they became fools, and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things (Rom 1:21-23).Natural Man, then, is quite sure of his own wisdom ... but is quite futile in his thinking. That's God's evaluation, not mine.
You should see, then, the dilemma we face. We are commanded to make a rational defense of the faith. We are obligated to stand for the truth, to argue our case, to contend for the faith. And at the same time, we are absolutely assured that the ones to whom we are presenting our defense are blind, incapable of understanding, futile in their thinking. We are to present this reasonable argument to those who, when it comes to this particular topic, cannot be reasonable. That's the primary problem of Apologetics.
Is there no hope, then? Not at all! I gave you 2 Corinthians 4:4 a moment ago. Look at the rest of the passage.
In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God. For what we proclaim is not ourselves, but Jesus Christ as Lord, with ourselves as your servants for Jesus' sake. For God, who said, 'Let light shine out of darkness,' has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ (2 Cor 4:4-6).Do you see the solution? Yes, indeed, they are blinded in the mind. No doubt. They cannot see "the light of the gospel of the glory of Christ." But we're talking here about God at work now. Remember Him? He's the one who said, "Let there be light" and there was light.
We are faced with the impossible task of presenting a rational defense to an irrational audience. We do so because we are commanded to do so. God requires it of us. That's the problem. The good news is that while we are responsible to present the best possible defense, we are not responsible for the results. That is God's job. And while we might have no means of overcoming futile thinking and blinded minds, God isn't limited like we are. Thus, when we engage in this necessary practice of contending for the faith and making our defense, we are participating in the work of God with certainty that when God wills He cannot fail. When He chooses to turn the lights on, they will see ... and you get to participate.*
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* Little hint here. As it turns out, this is the way we all get to understand. Paul told Timothy, "Think over what I say, for the Lord will give you understanding in everything" (2 Tim 2:7). See how that works? He says to think things over because in the process "the Lord will give you understanding". Just so you didn't think you figured it out all by yourself ... or that you don't need to think.