Someone who is religious believes in the tenants of their religion and considers religion important in their life. Other words for religious are devout, faithful, and pious.
Another word for religious group could be "faith community" or "religious organization."
'Dogma' is religious doctrine.
"Hymns" is another word for religious songs starting with the letter "h." Hymns are traditional religious songs typically sung in churches or during religious ceremonies.
sacriligious
smart ... or secular
Church, or culture.denominationreligionsectordercultdiocesestakeparish
Schism or sectarianism can be used as alternative terms for religious divisions.
pilgrimage crusade jihad
congregation
Religious tolerance or Religious toleration.
A group of religious people is often referred to as a congregation, parish, assembly, or community.
I am not sure there is another word. Quakerism is the life style of worshipping members and adherents of the various branches around the world of The Religious Society of Friends.