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My guess is that the majority of Christians see verses in passing or hear them at church – mostly whatever is most compatible with 21st century ethical dogma – and take them at face value.
On the rare occasion that a passage conflicts with said dogma it is rationalised away or, yes, interpreted metaphorically.
From an apologetics standpoint, some sections are metaphorical, some are not, and the difference is usually clear. Fx: New atheists often like to believe that they've shunted Christians into a corner on Genesis. In reality, metaphorical interpretation was the accepted view for millennia. That is, before Pr*testants turned up.