If you haven't had an experience with God, then you can only believe in God. This requires faith, because you can only believe what you do not know. For me God is a paradox. God is the greater understanding that exists beyond all understanding hence our technological evolution beyond the limits of the dogma of previous centuries. But, if God is the understanding the exists beyond all understanding, can God be defined? No! There is the sacred paradox. So to say that God is the understanding that exists beyond all understanding reveals the limits of my understanding, but God is not limited.