The "spiritual but not religious" trend has many factors including the belief that scientific ideas trump the truth value of all others. The idea that doubt is more prestigious and intellectually accommodating than faith probably comes from the Scientific Method. I believe we have adopted Karl Popper's idea that falsification is the demarcating boundary of Science, however we have not let go of the idea that verification by inductive reasoning can prove ideas to be true. We continue to look to Science to for proof of what does and does not exist without stopping to think whether or not Science actually has that power.
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