A figment of our imaginations?
We can answer the question of who God is in many ways.
The cross is the most identifiable symbol for Christianity in the world today. This is appropriate. Christians believe that at the cross, something profound changed for all time. The cross forms the starting point for many theological concepts - propitiation, justification, atonement. These are all important doctrines, but don't stress if you don't know what they mean. Underneath each is one significant truth that the cross teaches us, and it's something we can all understand.
When we look to the cross, we can confidently conclude that God is...love (1 John 4:8). If God does not even spare his own son (Romans 8:32) in the face of our own sin (Romans 5:8), we learn that he is for us and not against us.
For the depressive, it is all too easy to feel that God is out to get us, if he even exists at all. Scripture reminds us that not only is God real, but that he has acted in the most tangible way possible to show that he loves us. He sacrificed his Son so that you and I could live, and one day experience the full blessing of the new creation.
God is not out to get us. God does not delight in our suffering. He is not a tyrant. He is not imaginary.
He is love.
See what great love the Father has lavished on us, that we should be called children of God! And that is what we are!
1 John 3:1