This thread reminds me of these verses:
1 Corinthians 1: 23-24, 27 AMP
23 We preach Christ (the Messiah) crucified, [preaching which] to the Jews is a scandal and an offensive stumbling block [that springs a snare or trap], and to the Gentiles it is absurd and utterly unphilosophical nonsense.
24 But to those who are called, whether Jew or Greek (Gentile), Christ [is] the Power of God and the Wisdom of God.
27 [No] for God selected (deliberately chose) what in the world is foolish to put the wise to shame, and what the world calls weak to put the strong to shame.
If someone were to debate my faith, I would offer the explanation of answered prayer, emotional healing, and having all that I need in an unstable and insecure world.
I think that the most blessed prayer to pray for non-believers is that God reveals himself to them in a personal way.