Perhaps this has something to add to the discussion about the ‘diasporic’ nature of theology?
“Theology cannot lift itself, as it were, by its own boot straps, to the level of God; it cannot presuppose anything at all concerning the foundation, authorization, and destination of its statements. It can presuppose no help or buttress from the outside and just as little from within. If theology wished to provide a presupposition for its statements, it would mean that it sought to make them, itself, and its work safe from any attack, risk, or jeopardy. It would presume that it could and must secure them…Precisely in this way theology could sell its birthright for a mess of pottage. Theology can only do its work. It cannot, however, seek to secure its operation. Its work can be well done only when all presuppositions are renounced which would secure it from without or within.”
 Barth, Karl. Evangelical Theology: An Introduction, p. 50