Why religion caused southern partisan change?

In united states,  the most populated religious groups reside on the southern part of the united states.
Back then, most people within this group wanted the involvement of religion within the Government , while most of the northern population wanted the separation of States and church

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.