Science also believe that there is some external force or the energy that is present in the universe and from there the whole universe is running that is whether directly or indirectly. In the same way the according to the science there must be some efficient cause needed for the existence , there is existence of the things but who is the creator of the thing then. Though we have not seen our great great grandmother but also we believe him that he exists due to the evidence he left. In the same way due to the historical evidence left we also may believe in god. Not in the form of man or human shape but may be in the form of energy.
According to the statement of a great scientist of NASA he states that when he sees in the sky he sees various planets and stars moving in the unity and consistently but sometime he things if any planet move an inch from their corresponding orbit then huge explosion and collision may occur. All this are hold by a unknown that what we call god. Similarly the four forces or bases like gravity,electromagnetic, strong force and weak force rule the universe this have a constant quantity. They are designed so intelligently that if a certain quantity of the constant change by a small amount then the universe would be inappropriate to live and survive.
Hence in this way science can never prove the existence as it need the live evidence to prove but god will never appear.