When we read the Bible as a parable, as a series of object lessons told merely to prove a point, we miss something. When we treat the people within the Bible as mere characters in a story, we lose something incredibly important.
Object lessons are clean and simple. People, on the other hand, are messy and complicated. When we look at the life of Simon Peter, we see one of the messiest people in the entire New Testament. Peter walked on water and sank into the waves. He proclaimed who Jesus was and completely missed the point. He pledged his undying devotion to Christ, and even drew a sword in defense of his Lord, and then he abandoned Jesus and denied him three times.
Peter is also the rock on which Christ would build his church--the same church of which Paul says we are a part.
So come. Walk with Peter. Fish with him. Follow a strange rabbi, though it might cost you everything. Walk on water, though you might sink. Go to Jerusalem, though death awaits you. Stand with Peter as God uses him to build his church, and watch that church grow.