Sometimes we think that growing up means growing out of our faith, but don't confuse sophistication with maturity. Phrases like, "the Jesus of history and the Christ of faith" are catchy, but heretical.
Jesus asks us to believe in Him, not to explain Him (though there is much to say about Him, and we look forward to spending eternity singing His praises). When we come across a question like the one posed in John 6:52, "The Jews then disputed among themselves, saying, 'How can this man give us his flesh to eat?'" we know we are dealing with explainers, not believers.
Am I saying there is no room for the head in the heart of the faith? Of course not, but you'll have to click here to watch the sermon or read the transcript to find out why faith requires daily intellectual effort, and what to do when doubts arise.