Why then are atheists so impressed, and Christians so intimidated, when a professing atheist says, "I was raised in a Christian home. I was a dedicated follower of Christ until the age of 17. I wore Christian t-shirts and put a W.W.J.D. bumper sticker on my first car. I was in youth group every week"? I think one possible reasons is that many Christians are afraid to admit, let alone address, the fact that it is entirely possible to have an immature understanding of Christianity. A well developed Christian worldview doesn't just happen. I think the very idea makes some Christians squeamish. They want to think that, if a person is truly a Christian, especially if they attend Church regularly, they have a mature understanding of Christianity. But that doesn't even make sense. On top of that, it isn't biblical. Paul addressed immature ways of thinking about Christianity in several of his letters. The writer of Hebrews indicates that there is a difference between the elementary things (milk) and the mature (solid food), and that some people are slow to move on. It doesn't matter how old a person is or how long they have been a Christian. Some people have been attending church for 50 years and still have a very shallow understanding of Christianity.
So, what is the first step towards getting better? Acknowledging that we have a problem, of course. Many believers have an immature understanding of Christianity. There it is. But we don't need to be afraid to admit it. It isn't actually a bad thing. It is a reality that will exist as long as Christians do. It is only a problem when we ignore it. We also do not need to plug our ears and pretend that a well-developed Christian worldview will just happen if we circle the wagons and just give it enough time. We need to face these facts head on and start being intentional about discipleship, particularly with young people. If we don't, we will continue being surprised by how many people (especially 20 and 30 somethings) have "de-conversion testimonies" that reveal an incredibly immature understanding of Christianity.