It is unknown; because, there is a question mark; who is God? Whether God exists or not? It is a mystery to you. And you, listening God’s dictate, surrender yourself to Him/her, you start praying; and nothing happens; and this continues.
You are running in a wrong direction. And, without realizing this; you surrender yourself to the Lord. Without understanding; without knowing the Lord; you surrender yourself; with full devotion.
You start praying; without realizing this fact; that your prayer is reaching nowhere. Obviously, your prayer is not answered. Your blame game starts. First, understand; realize the Truth. The Truth is within you.
Lord Shri, Krishna says; “surrender to me….” God is continuously asking you to “surrender to me".