what’s that mean?

I regularly hear people say they believe in God, and I wonder—what’s that mean? Do they embrace God’s desire that they live for him and in him? Do they passionately attempt to align their hearts with the heart of God? Do they seek to become apprentices of Jesus, striving to pattern every aspect of their lives after him? Do they attempt to conform every thought, every impulse, every emotion, every action to the will of God? Isn’t that what it really means to believe in God?