Why is there no Walmart in Afghanistan? Because there's a target on every corner
Are you saying that all Muslims are targets or that they view everything as a target?
I don't know, maybe muslims can't gross up in their minds how to shop at Walmart?
If you want to really bring home a joke, offensive or not, make sure it's clear and doesn't leave any confusion about your phrasing. Making fun of Muslim stereotypes isn't the best topic for a joke.