Zahid Chisti is a meticulous man. As a pharmacist he has to be -- he must carefully count the pills and measure the medicine he dispenses. When it come to money, Zahid also likes to do things by the book -- in this case the Koran.

"Under Sharia Law we're prohibited from taking or giving interest." says Zahid. "I try to avoid taking or giving interest in any of the transactions I process, in my business or in my personal life."

When he saves money with his local Islamic bank, Zahid gets a return but he doesn't officially earn interest. He shares in the profit the bank makes from investing his funds and the bank does not invest in anything "un-Islamic," like alcohol or gambling.

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