theism

US /ˈθiː.ɪ.zəm/
UK /ˈθiː.ɪ.zəm/
1.

theisme

belief in the existence of a god or gods, especially a god who created the world and who acts to influence events:

:
Russell, the famous philosopher, rejected theism on the grounds that it can be neither proven nor disproven that God exists.