 In the reign of Akhenaten ( c . <unk> – 1336 BC ) in the mid @-@ New Kingdom , a single solar deity , the Aten , became the sole focus of the state religion . Akhenaten ceased to fund the temples of other deities and erased the gods ' names and images on monuments , targeting Amun in particular . This new religious system , sometimes called Atenism , differed dramatically from the polytheistic worship of many gods in all other periods . Whereas , in earlier times , newly important gods were integrated into existing religious beliefs , Atenism insisted on a single understanding of the divine that excluded the traditional multiplicity of perspectives . Yet Atenism may not have been full monotheism , which totally excludes belief in other deities . There is evidence suggesting that the general populace was still allowed to worship other gods in private . The picture is further complicated by Atenism 's apparent tolerance for some other deities , like Shu . For these reasons , the Egyptologist Dominic Montserrat suggested that Akhenaten may have been <unk> , <unk> a single deity while acknowledging the existence of others . In any case , Atenism 's aberrant theology did not take root among the Egyptian populace , and Akhenaten 's successors returned to traditional beliefs . 
