Usage patterns
宗派を問わずregardless of religious sect/denomination
This temple can be visited by anyone, regardless of sect.
〈人〉が〈宗派〉に属するsomeone belongs to a (particular) sect
He belongs to the sect known as Jodo Shinshu.
〈事〉が宗派に分かれるsomething splits into different sects/schools
Buddhism has split into many sects over its history.