Christ did not Reveal everything, so He could not be the only way:

Only the Spirit of Truth (The Seventh Angel) will eventually Reveal the whole Truth:

John 16:12-13
12 I have yet many things to say unto you, but ye cannot bear them now.

13 How be it when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.