I'm not sure but what nationality are the majority Asian WGs in the UK?
Chinese and Thai spring to mind and the proportion of muslims in their countries is pretty low.
Happy to be corrected if you have a better reasoned or evidenced opinion.
I guess its what is covered by "Asian". Also I guess that Thai/Chinese are by far the biggest group of "Asian" SP's in the UK.
Below is some info from internet.
62% of the world's Muslims live in Asia, with Indonesia, Pakistan, India and Bangladesh having the four largest Muslim populations in the world.
Islam is a minority faith in Thailand, with statistics suggesting 4.9 percent of the population are Muslim.
Currently, Muslims are a minority group in China, representing between 0.45% to 1.8% of the total population according to the latest estimates.