Why not just try your eyes!
You tell me how to "see" (and measure) what it is they think and believe. You submit that it's all subjective, but that my assesment is wrong. By what measure?
"My job" is not to "tell you what to see," but to "show you where to look." It's because I DON'T want Truth to be "subjective" that I so strongly advise you to go look for yourself.
I AM NOT THE "MEASURE" OF TRUTH. And NEITHER ARE YOU.
GOD alone IS [among other things, the Measure].
But you have reason and free will, and so therefore are perfectly well-equipped to form your own understandings of things. Again, I am only showing you where to look, not telling you what to think of the things you might see, should you accept my direction.
As far as you are concerned, you are responsible for figuring that out, not me.
If you don't want to look where I'm pointing, perhaps that only means you've cut yourself off from a treasure of human experience and understanding that goes back millennia.
Still, to say that is not to "foredoom" your own free conclusions in the matter.