This is also God's main problem. He loves the world but the world doesn't always love him in return. He cannot force anyone to love him.
God met Bruce and gave him almighty power.
The culmination in the movie was when Bruce tried to force his ex girlfriend to love him, but it couldn't be done.
In the movie God also said that if he doesn't answer prayers for a while they start to echo in his head. Point is that we should pray until something happens.
