Secularity is the state of being separate from religion. One approximate synonym for secular is worldly; another could be phrased as neutral in religious matters. Approximate antonyms for secular are religious and devout. Secularism is an assertion or belief that religious issues should not be the basis of politics, a movement that promotes those ideas or (in the extreme) an ideology that holds that religion has no place in public life. Secularist organizations are distinguished from merely secular ones by their political advocacy of such positions.
Sacred means to be set apart by solemn religious ceremony; especially, in a good sense, made holy; set apart to religious use; consecrated; not profane or common; as, a sacred place; a sacred day; sacred service. Holiness is to be exalted or worthy of complete devotion as one perfect in goodness and righteousness.