You didn’t answer the question So I’ll ask again:
Where does it say they’re American citizens?
The article stated they were Iraqis.
You making it up as you go or do you have any facts?
Dave Alwatan, an Iraqi-American, tells a Chicago TV station.
Well here you go. Also his name Dave implies that he is a Christian from Iraq.
Also read this http://www.freerepublic.com/focus/f-news/1888901/posts