Sect
Denomination
noun, の adjective
A religion sect is a sect within religion, most likely, but it can be simply referred to as a sect or denomination.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
その会議には、あらゆる宗派の人々が集いました。
People of all denominations got together at the meeting.
仏教にはさまざまな宗派があります。
There are various sects in Buddhism.
キリスト教といっても多くの宗派があって、それぞれ教義が少し違うんです。
Even within Christianity there are many denominations, each with slightly different doctrines.