Well, you open up a new topic of debate with such an assertion. To which I answer most briefly. Every religion/cult/spiritualism relies on symbol and myth to break through to the divine. However, all of them rely on the revelation or ideas of one man, who purports to understand the proper symbols/rituals/acts to break through to the other side. Except for one and only one religion. In that religion, the symbolism and ritual transcends the ideas of one man or one group. Rather, its cultic practices and prophetic utterances are spread out over 2000 years of history. Once those cultic practices and prophecies find their fulfilment in one man, a man who truly lived in history yet also fulfilled all symbolizations of the established 2000 year-old religion, then the religion he founded would, it would seem, to have a certain authority above all others.
Anyone can invent a religion, in the here and now. But only God can insert himself in history in such a way as to leave clues pointing to a time, a season, a place, and a person. And when that person actually comes....
Ponder the difference between a mere archetypal symbol, which is deeply meaningful, yet non-living, versus a symbol prefigured for thousands of years and which comes, suddenly, to light, alive.