What is the denomination of the school the most players belong to?
SELECT T2.Denomination FROM player AS T1 JOIN school AS T2 ON T1.School_ID  =  T2.School_ID GROUP BY T1.School_ID ORDER BY COUNT(*) DESC LIMIT 1
SELECT T2.Denomination FROM player AS T1 JOIN school AS T2 ON T1.School_ID  =  T2.School_ID GROUP BY T1.School_ID ORDER BY COUNT(*) DESC LIMIT 1
[{'Denomination': 'Catholic'}]