Nietzche - I clearly need to do some more research on Nietzche before answering your explanations of his theories. Perhaps it is just beyond my mental capacity to understand how nothing can be proven.
I don't necessarily agree that religion, Christianity anyway, suppresses us to be less than we can be - on the contrary. Christians may define success differently though. Monetary wealth is not important. Why should it be? Christians are encouraged to use all their gifts to their fullest potential.
Thinking and reasoning...
When I was a child, I went to church blind, I believed in God because my parents told me to, I didn't question. When I became older, I learned to question and wanted proof about Christianity. I consider myself a person to follow logic, and I had to make sure that my faith followed logic. I did some research. The FACTS around the Resurrections and the Creation gave me what I needed. I used Thinking and Reasoning.
If God allowed all people to come into heaven, yes that's encouraging. But what would be discouraging would be that that would mean that there is no... repercussion, no accountability. No matter how someone lives, they are treated the same in the afterlife? What about the holocaust, the Nazis, Hitler? Think about the most evil person you can in history, maybe it's me, I don't know. It's a very discouraging thought to think that I'm going to see that person again in Heaven, that they are going to get the same rewards that I'm going to get. If there is no Hell, what is the difference how I live my life. I might come stab you to death out of spite, what difference does it make? Also, in order to be forgiven, you have to ask for forgiveness.
Getting back on topic...
In the DC Universe, I think that all characters at least have to acknowledge the existence of any and all gods. Some characters are descendants of or given powers by Greek gods, there are demons in the DCU, there are angels, there are aliens, and also just plain wierdos. They may not worship any particular god, but they have to at least acknowledge their existence. Now, if I were writing the Who's Who entry on Batman, I would think that he acknowledges the existence of God but refuses to give him any recognition (if that makes sense) because he's so mind-bent on one thing.