~snip~
It's not about allowing a Muslim country to host the world cup, the most important thing is about the country's rules because even some Musil country they have rules everyone should respect, and doesn't matter if they are hosting a world cup or not whether in other Muslim countries, they will expect the visitors from other countries to do not drink alcohol and they take it hard for them.
It doesn't even have to be a Muslim country. In Brazil they had laws that prohibited the sale of alcohol inside the stadium, but when FIFA brought the world cup there, they simply changed the law, and sold alcohol in the stadiums.
At the end of the day, money talks.