Find "any" school which will accept your children, as many if not most, have waiting lists. Focus on academics quality of the school, as religious and cultural teachings can be supplemented, but not the other way around.

Here is the list of schools,
http://www.qatarliving.com/the-qatar-guide/education/primary-and-seconda...

(all 7 digit phone number require duplicating the first digit to make them 8, new numbering in 2010)