Wondering whether Christianity is real is not the same as wondering whether Christianity is true. If you question the truth of Christianity, you can do something tangible about it. You can read books, take a class, or talk to someone about it. But what can you do when you're already convinced it's true but don't experience it as real?
Seeing Is Believing: Experience Jesus Through Imaginative Prayer (ed. Baker Books, 2004) - ISBN: 9780801065026