Question: what religion does Mary Todd Lincoln joined in which Saint Peter is a founding figure?
Answer(s):
answer: Catholicism

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01ypl0)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01ypl0 ns:people.person.religion ?x .
?x ns:religion.religion.founding_figures ns:m.071wp . 
}