[Dec31,1999]

Seriously, I bet they're not stupid enough to hide in a church.

Nah, they'll hang out in mosques. It's much safer.

[concerned about politics]

Nah, they'll hang out in mosques. It's much safer.

They probably have some kind of Muslim underground railroad.

[Angelus Errare]

Actually, al-Qaeda generally uses the traditional safehouse arrangements (warehouses, hotels, ect.) and uses the mosques more as storage facilities for weapons, documents, and cash as well as training centers. This is especially beneficial for them because mosques are generally tax exempt and law enforcement are usually unwilling to risk getting a search warrant unless they're certain that their man is inside.