Out of respect for your great customer service and being a guest in your establishment I did not want to lose my cool. Please do not allow this disrespectful behavior to happen again. I approached your employees to take action and they informed me this is not the first time these guys did this and they went about their business.
Either I am at fault for not confronting them directly, or you care about losing ignorant clients like this. Everyone was staring at them and no one said anything. If there is one thing your employees could do to respect other cultures, it would have been to place your place mats on the prayer mat in respect for the Ka'aba they are throwing their cards on. Your employees approach all guests to see if they need anything EVERY 10 minutes and yet they allowed this to continue on more than one occasion as I was informed.
I posted this here since they removed my comments off their facebook page without showing any interest / acknowledgement.