Question: What predominant religion in Russia that worships at mosque?
Answer(s):
answer: Islam

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06bnz)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06bnz ns:location.statistical_region.religions ?y .
?y ns:location.religion_percentage.religion ?x .
?x ns:religion.religion.types_of_places_of_worship ns:m.04_xn . 
}