"The decision ... debunks the myth that Islamic finance is unacceptable and unlikely to withstand legal challenges to its validity in court," said Megat Hizaini Hassan, head of Islamic finance at Malaysian law firm Lee Hishammuddin Allen & Gledhill.
"Once the financial services industry in the US realises that there should be no major legal issues, then hopefully this may help to make Islamic finance more acceptable in the mainstream."
Islamic finance has been plagued by criticism in the U.S. that it is a means of funneling funds to terrorists or a plot by Muslims to spread a system of Islamic principles known as sharia has plagued the industry in the U.S.
In his opinion, District Judge Lawrence Zatkoff, said the plaintiff did not prove that AIG's sharia-compliant businesses engaged in religious indoctrination.
The distinction between sharia-compliant business as a financial model and overall Islamic law, is a positive step for Islamic finance growth in the U.S., lawyers said, but is just one battle won as the industry seeks to grow.
"The case helps the industry by putting the fringe element that is fearful of sharia in its place," said Isam Salah, partner at King & Spalding in New York. "But I expect we'll see more of these kinds of cases as we see a multi-pronged effort to combat all things Islamic in the U.S."
An appeal of the ruling has already been filed to the Sixth Circuit Court of Appeals, said David Yerushalmi, Murray's attorney and general counsel for the Center for Security Policy.
"Sharia compliant finance is a religious endeavour, there is no way you can separate it from political Islam," Yerushalmi said. "Sharia can't be cut up and diced, it's an integral whole."