"God" is a vague concept that is depends on faith to feel it. Religious leaders use the term because it limits discussion as to the nature of God and makes us choose between blind belief or excommunication.

Personally, I prefer the (also vague) concept of Spirituality. It leaves room for many individual perspectives but encompasses a sense of connection to something bigger than ourselves, and typically involves a search for meaning in life. It is very personal and you either feel it or you don't. If you don't you are not chastised for it since it is so personal. Just my thoughts.