What religion does Billy Graham subscribe to? Does #1 allow for the uncertainty of God's existence?
Agnosticism
Bill Graham was a prominent American evangelical leader. In Christianity, evangelism is the commitment to or act of publicly preaching (ministry) of the Gospel with the intention to share the message and teachings of Jesus Christ.  Agnosticism is the belief that humanity is unsure if God exists. Evangelical Christians share the belief that God exists.
view that the existence of any deity is unknown or unknowable
Does Billy Graham support agnosticism?