Iwi . Ngai  ( Enkai ,  En-kai ,  Engai ,  Eng-ai ,  Mweai ,  Mwiai ) is the supreme  God  in the religions of the  Kamba ,  Kikuyu  and  Maasai  nationalities of  Kenya . According to the Kikuyu beliefs, he lives on the holy mountain  Kirinyaga  ( Mount Kenya ). According