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And there are some philosophers of science and professional scientists who likewise do not claim that their theories are necessarily "true" or that they reflect reality. Some are happy to view scientific theories as pragmatic models or constructs that may actually have no fundamental reality (i.e. there may actually be no such thing as a quark).
To start with let it be noted that you do not answer the point that your "acid test" is widely rejected by Christians - either implicitly or even explicitly. That in itself kills your claim of a parallel.
I am aware of the view that we should not accept even a scientific view of reality and even the proper name for such a view (Instrumentalism), I am not aware of any Christians, even the most liberal, who would go quite so far, even if we include the Sea of Faith and their "non-literalist God"
Indeed, it seems that the view of Christianity you are putting forward is not one that many would take seriously. Many object when a liberal Christian says that it is not necessary to believe in the Virgin Birth or that the literal resurrection of Jesus is of no real importance. Indeed, it seems that I am almost a Christian in your view, lacking only the faith commitment that the Bible is consistent. I don't believe in God, I think that Jesus was a failed wannabe messiah and I reject the whole concept of salvation. How many self-styled Christians here would accept me as one of them ?
So it seems that even taking your view to the ridiculous extreme there is still an element of faith that cannot be removed. Even if we throw out the idea that there is any truth at all in the religious claims of the Bible you must still assume that the Bible is at least consistent on those claims. But that is something that is itself questionable.