Question: What god is believed in by the religion whose sacred site is Grotto-heavens?
Answer(s):
answer: He Xiangu
answer: Cao Guojiu
answer: Li Tieguai
answer: Lan Caihe
answer: Lü Dongbin
answer: Han Xiangzi
answer: Zhang Guolao
answer: Zhongli Quan
answer: Jade Emperor
answer: Queen Mother of the West
answer: Three Pure Ones
answer: Magu
answer: Yuanshi Tianzun
answer: Cai Shen

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:religion.religion.sacred_sites ns:m.027n2wt . 
?c ns:religion.religion.deities ?x .
}