The catholic church (no I aint picking on them) used to state quite clearly where Heaven was; where Hell was. Now that NASA flies directly through heaven (and guess what?) and can seismically study where Hell is supposed to be, theists are retreating now into allegory and metaphor. Which is NOT what they used to claim. Their insular, mundane and petty little world is shrinking away to zero whilst the rest of us are just beginning to scratch the surface.
Would you point me towards some sources that show this because if it is so, then that was a little silly of them.
On further thought, wasn't the best thinking for centuries, if not millennia, that heaven was above and hell below?
1600 years ago, for example, Augustine argued against taking the first creation story in Genesis literally:
"It not infrequently happens that something about the earth, about the sky, about other elements of this world, about the motion and rotation or even the magnitude and distances of the stars, about definite eclipses of the sun and moon, about the passage of years and seasons, about the nature of animals, of fruits, of stones, and of other such things, may be known with the greatest certainty by reasoning or by experience, even by one who is not a Christian. It is too disgraceful and ruinous, though, and greatly to be avoided, that he [the non-Christian] should hear a Christian speaking so idiotically on these matters, and as if in accord with Christian writings, that he might say that he could scarcely keep from laughing when he saw how totally in error they are. In view of this and in keeping it in mind constantly while dealing with the book of Genesis, I have, insofar as I was able, explained in detail and set forth for consideration the meanings of obscure passages, taking care not to affirm rashly some one meaning to the prejudice of another and perhaps better explanation." (The Literal Interpretation of Genesis 1:19–20, Chapt. 19 [AD 408])
Reasoning and experience have a strong part to play. I quote the above to show that non-literal interpretations are not modern and therefore to portray Xtianity as desperately moving from literal to allegory is not accurate, as there has been a strong understanding of the non-scientific nature of Bible texts from early on.