What you are saying is very true. If you follow the color mapping scheme of
Spiral Dynamics, when someone at the red vmeme level reads the Bible, they find a red level tribal-warrior Jesus supporting their view of reality. Someone at the blue level, a blue level authoritarian Jesus; the orange level, an orange Jesus; green level, a green Jesus; yellow, yellow; turquoise, turquoise, etc.
This is the power of icons and symbols. They both affirm ourselves, and also inspire advance to the next stage as the situation, or the environment necessitates. When anyone says 'this is what the Bible teaches', they are only seeing what their current set of eyes allows them to see. The rest simply filters right through and into a blank hole. It cannot be seen, because their eyes can't see that spectrum of light, so to speak. That of course is not permanent, but existing only at the stage of development. They shape of the eye develops so to speak, to allow seeing the other colors.
I understand metaphorically what you're saying about starting with a blank slate, but I don't believe that's entirely possible in the literal sense. We always build upon what came before. We essentially negate the previous understandings view as the dominant force, but we take the useful bits forward with us that serve us in the new understanding and build upon those. For instance, knowing a sense of love and community in a tribal-centered world view, is brought forward and expanded upon in breaking down the blood-ties world in favor of a larger ethnic community. You now widen the circle loving others in your community beyond just family bloodlines. Then you take that love in that circle, that structure, and move it forward, negating the limits of ethnocentric worldviews, and extend love to the global community, and so on. Love is advancing forward, using the structures of consciousness along the way of its 'transcend and include' path.
The blank slate essentially means to me, breaking down the exclusive view of the current level and creating new structures of understanding that allow for a wider, more inclusive understanding of what came before.