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The difference between Islamic Banks and Western Banks
I'm not sure of the theological basis against usury in sharia law. IIRC, sharia forbids excess compensation, and the modern interpretation of this includes interest.  Rules about banking are common in religious faiths. The Catholic church viewed interest as the "selling of time", and since time is a force controlled by god, charging interest was a heretical practice. For private transactions, modern Islamic banking is a relatively new phenomenon that emerged in the postwar period. I don't think this method of banking is a "house of cards", it's just different. Some US states, like California, also subject lenders to higher levels of risk. (ie. borrowers can walk)