Doubting the truths of the Bible is seen as normal these days. One can read this in books and articles. Doubt and not-believing (the next step) are considered fully human in a time in which people no longer believe that anyone can know the truth.
This article discusses the essence of Jesus' miracle of changing water to wine (John 2:1-12).
This article is a Bible study on John 10:1-18.
This article is a Bible study on John 15:1-17.