hi ken, :)
i believe that it is fairly obvious that most religions and spiritual practices come from the same ultimate place. what i mean, is that people like gautama the "buddha", and jesus the "christ", and paul the "missonary", and walt whitman the "poet" etc etc have all experienced the same enlightenment, but their followers have grossly misinterpreted the path.
the buddha believed what the hindus believe, and that's that there are billions of paths to the same place: illumination, or Bhramic Splendor. this is another way of saying that the path to enlightenment is not found by following another holyman, but in awakening to one's own god-nature, and following that intensly personal and solitary path to the light of Being. the compulsive thought-free mind, now.
"truth" is a label, and conceptual abstraction in your mind, for something that either exists outside of it, or inside of it (same with "proof"). either way, truth will only really be found by resting in the sublime moment, free of the ego-self and the chattering mind. truth is not a mind thing. the mind just understands that it exists, is all. a teacher can help you get to this place, and understand that it exists deep in you, perhaps beyond "mind", but there must come a time when the teacher should be left behind, as the buddha and the christ would surely agree, imho. afterall, they were apostates to their own traditions anyways, hinduism and judaism respectively.
so, in other words, proof and truth, in the spiritual sense, are not going to come from following any other spiritual tradition. it's only going to come from inside You. and when that happens, those two labels won't mean much anymore.
peace,
tetra