Why is this a problem? There are muslims in the US, they want Sharia products. Are you against selling Brazilian soda’s in Brazilian supermarkets? Are you against selling chinese food products to chinese immigrants? Are you against selling Mexican food products to mexicans?
But there is a danger that once Muslims succeed in bringing into existence Sharia products by pressuring corporations, it becomes that much easier for them to bring into existence Sharia laws by pressuring government - especially if the previously affected corporations (like AIG) are major political contributors.