The Prime minister who worked in the Khmer Issarak follows which religion?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/militaryBranch> <http://dbpedia.org/resource/Khmer_Issarak> . ?x <http://dbpedia.org/ontology/religion> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/PrimeMinister>}
Khmer_Issarak