Christianity is wrong and Christians cannot see it. Why? Part of the reason is confirmation bias. We only see what confirms our belief. Another is sentinel memes that form mind traps that guard against an honest assessment of the evidence. What evidence? The evidence that the books of the New Testament were selected 300 years after the death of Christ and by only one branch of the church. The evidence from textual criticism that shows that no two ancient manuscripts of the New Testament agree. And that there disagreements would fill a book larder than the Bible. And the evidence that an all-powerful and all-good God is a contradicted by the prevalence of evil.

For more information see Jay Forrest's book Nontheism Defended.