Come al solito Wikipedia in inglese da' maggiori informazioni:

In an Islamic mortgage transaction, instead of loaning the buyer money to purchase the item, a bank might buy the item itself from the seller, and re-sell it to the buyer at a profit, while allowing the buyer to pay the bank in installments. However, the fact that it is profit cannot be made explicit and therefore there are no additional penalties for late payment. In order to protect itself against default, the bank asks for strict collateral. The goods or land is registered to the name of the buyer from the start of the transaction. This arrangement is called Murabaha. Another approach is EIjara wa EIqtina, which is similar to real-estate leasing. Islamic banks handle loans for vehicles in a similar way (selling the vehicle at a higher-than-market price to the debtor and then retaining ownership of the vehicle until the loan is paid). There are several other approaches used in business deals. Islamic banks lend their money to companies by issuing floating rate interest loans. The floating rate of interest is pegged to the company's individual rate of return. Thus the bank's profit on the loan is equal to a certain percentage of the company's profits. Once the principal amount of the loan is repaid, the profit-sharing arrangement is concluded. This practice is called Musharaka. Further, Mudaraba is venture capital funding of an entrepreneur who provides labor while financing is provided by the bank so that both profit and risk are shared. Such participatory arrangements between capital and labor reflect the Islamic view that the borrower must not bear all the risk/cost of a failure, resulting in a balanced distribution of income and not allowing lender to monopolize the economy.

In pratica l'accordo sembra essere molto piu' onesto ed etico. I mutui ricordano gli affitti a riscatto con cui molta gente nei tempi belli ha potuto comprare un'abitazione da vari enti statali, i finanziamenti alle imprese sembrano essere partecipazioni non solo degli utili, ma anche dei rischi.

Mi sa che mi convertiro', Allah e' generoso...