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AsifAmeer:
I advocate Islamic Banking - even with its shortcomings. My knowledge on Islamic Banking is miniscule and I resign myself to the authorities in this matter (The Mufti Taqi Usmanis, Shaykh Taha Karaans of the Islamic world). They have done extensive research on the matter and come about with guidelines and an industry that is purely in the hands of Muslims that must have crossed a trillion dollar USD mark by now (you can correct me on the figure if I am wrong).
Admittedly, there are flaws, but this is still work in progress and not a finished system. True Islamic Banking will remain impossible unless the entire financial and political structure of the Muslim World (or a country at best) doesn't change dramatically. At the moment, everyone who bashes Islamic Banking (amongst self-styled scholars) are mostly those who have very weak grounding in faith (let alone Jursiprudence and that too specialized in Economics and Finance).
The problem with folks like Umer Vadillo is that they construct their arguments around a strawman which they then go on to destroy and claim victory. Mufti Taqi Uthmani and Shaykh Taha Karaan are NOWHERE NEAR 'modernists' much less post-modernists. In fact, both these shuyukh are experts of anti-post-modernism and as orthodox in creed as it gets. Vadillo saheb needs to first learn Jurisprudence before he can even start talking on this topic. Just because a lot of Islamic and Conventional banking coincides in principle and in terms of modalities doesn't mean it becomes haram.
It would be like saying that because Jews believe in One God and Prophets and Angels etc, then we Muslims shouldn't believe in these things because Jews are kuffaar! Trust me when I say this much: Everyone who bashes Islamic Banking has absolutely ZERO grounding in Jurisprudence. Moreover these bashers live in a dichotomous world where they think it is as simple as just uprooting the current financial system in the world and replacing it with a 100% Islamic financial system overnight. This is not only not plausible, but wishful thinking. The change towards a best case Islamic financial scenario will have to be gradual as will its polity.