The Temple District is one of seven districts in Athkatla. As the name suggests, this is the most religious part of Athkatla. The main religion is the Order of Helm, though there is also the Order of Lathander and the Order of Talos. Underneath the district are the sewers.
The first time you would visit the district, you will find someone called Gaal trying to convince the people of Athkatla that their god, Helm, is completely fake and his god, the Unseeing Eye, is the deity of the one true religion. This starts the Cult of the Unseeing Eye quest.