Just because there is sufficient evidence for something, e.g. the existence of god does not mean that there is going to be a positive response of belief according to what the evidence would warrant. It is God who opens the eyes of the spiritually blind not "evidence" or the rhetoric of man. Elocution at its finest falls on deaf ears if God has not opened them. Persuasion at its best is just that--persuasion. Truth is hard to get across sometimes.
Have you ever tried to argue with and atheist on the existence of God, some one of a different religion, or even believers in the same faith and found that there was no positive results, but both went away saying, "one day you will see the truth." This is what happens every time I argue with a charismatic on the topic of speaking in tongues, or with a Jehovah's witness on the deity of Christ. No matter how much scriptural, scientific, philosophical, evidence is brought forth in argument I have the same overall results.
I have never heard of an atheist stop the debate and say "you are right the evidence is overwhelming." "I repent of my sins and believe!"
Evidence, truth, and persuasion, have their limitations.
It is like arguing with someone who cannot remember the facts of the past. Or someone that alters and twists the point. If you call it white they will call it black. You cannot win arguments with those that come to the debate floor with their minds already made up in advance! People have a way of making themselves out to be right regardless of the evidence. Our fallen minds have an uncanny ability to filter out what it does not like (Rom. 1).
The philosopher Kierkegaard observed that psychologically we remember the things we want to remember but forget the things that we don't want to remember.
The facts don't always speak for themselves. "And when they heard of the resurrection of the dead, some mocked" (Act. 17:32). "When they saw him, they worshiped him; but some doubted" (Mat. 28:17).
I have heard many times that it is impossible to prove the existence of God. "If he would just reveal himself" the argument goes, "I would believe." Really?