There are three positions people can take on the question of the existence of God.
Theist - someone who believes that God exists. Theists do not necessarily believe they can prove God’s existence. Sikhs are theists.
Agnostic - someone who holds the view that it is impossible to know the truth about some things, such as God’s existence or the afterlifeLife after death..
Atheist - someone who holds the view that there is no God. Atheists do not necessarily believe they can prove atheism to be true.