I think these might also help in your search, if God wills it (though I think I am "not to be called teacher). I'm using the World English Bible (unless I have deviated from so doing against my present plan):
2 Corinthians 4:1-6 - Therefore, seeing we have this ministry, even as we obtained mercy, we don’t faint. But we have renounced the hidden things of shame, not walking in craftiness nor handling the word of God deceitfully, but by the manifestation of the truth commending ourselves to every man’s conscience in the sight of God. Even if our Good News is veiled, it is veiled in those who are dying, in whom the god of this world has blinded the minds of the unbelieving, that the light of the Good News of the glory of Christ, who is the image of God, should not dawn on them. For we don’t preach ourselves, but Christ Jesus as Lord, and ourselves as your servants for Jesus’ sake, seeing it is God who said, “Light will shine out of darkness,” who has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ.
1 Corinthians 1:18-31 - For the word of the cross is foolishness to those who are dying, but to us who are being saved it is the power of God. For it is written, “I will destroy the wisdom of the wise. I will bring the discernment of the discerning to nothing.” Where is the wise? Where is the scribe? Where is the debater of this age? Hasn’t God made foolish the wisdom of this world? For seeing that in the wisdom of God, the world through its wisdom didn’t know God, it was God’s good pleasure through the foolishness of the preaching to save those who believe. For Jews ask for signs, Greeks seek after wisdom, but we preach Christ crucified, a stumbling block to Jews and foolishness to Greeks, but to those who are called, both Jews and Greeks, Christ is the power of God and the wisdom of God; because the foolishness of God is wiser than men, and the weakness of God is stronger than men. For you see your calling, brothers, that not many are wise according to the flesh, not many mighty, and not many noble; but God chose the foolish things of the world that he might put to shame those who are wise. God chose the weak things of the world that he might put to shame the things that are strong. God chose the lowly things of the world, and the things that are despised, and the things that don’t exist, that he might bring to nothing the things that exist, that no flesh should boast before God. Because of him, you are in Christ Jesus, who was made to us wisdom from God, and righteousness and sanctification, and redemption, that, as it is written, “He who boasts, let him boast in the Lord.”
1 Corinthians 3:19 - For the wisdom of this world is foolishness with God. For it is written, “He has taken the wise in their craftiness.”
(Aside: It seems to me that the Christian is to rely on a different wisdom and reasoning than an atheist of the world might.)
1 Corinthians 2:6-16 - We speak wisdom, however, among those who are full grown, yet a wisdom not of this world nor of the rulers of this world who are coming to nothing. But we speak God’s wisdom in a mystery, the wisdom that has been hidden, which God foreordained before the worlds for our glory, which none of the rulers of this world has known. For had they known it, they wouldn’t have crucified the Lord of glory. But as it is written, “Things which an eye didn’t see, and an ear didn’t hear, which didn’t enter into the heart of man, these God has prepared for those who love him.” But to us, God revealed them through the Spirit. For the Spirit searches all things, yes, the deep things of God. For who among men knows the things of a man except the spirit of the man which is in him? Even so, no one knows the things of God except God’s Spirit. But we received not the spirit of the world, but the Spirit which is from God, that we might know the things that were freely given to us by God. We also speak these things, not in words which man’s wisdom teaches but which the Holy Spirit teaches, comparing spiritual things with spiritual things. Now the natural man doesn’t receive the things of God’s Spirit, for they are foolishness to him; and he can’t know them, because they are spiritually discerned. But he who is spiritual discerns all things, and he himself is to be judged by no one. “For who has known the mind of the Lord that he should instruct him?” But we have Christ’s mind.
James 3:17-18 - But the wisdom that is from above is first pure, then peaceful, gentle, reasonable, full of mercy and good fruits, without partiality, and without hypocrisy. Now the fruit of righteousness is sown in peace by those who make peace.
In persuading the atheist, the following seems considerable:
2 Timothy 2:24-26 - The Lord’s servant must not quarrel, but be gentle toward all, able to teach, patient, in gentleness correcting those who oppose him. Perhaps God may give them repentance leading to a full knowledge of the truth, and they may recover themselves out of the devil’s snare, having been taken captive by him to do his will.
Proverbs 15:1 - A gentle answer turns away wrath, but a harsh word stirs up anger.
