The term 'lacking faith in God' can be summarized by the word AGNOSTIC, which is an 8-letter word. Agnosticism is the belief that the existence of a higher power or deity cannot be known or proven. It is a philosophical stance that does not deny the possibility of a higher power, but instead states that it is impossible to know for certain whether or not one exists. Agnostics may also believe that the concept of a higher power is unknowable or irrelevant.