The problem with prayer.

[The Valkyrie]

Why would you do anything that doesn't revolve around yourself if you are the center of your focus?

Why would most people do what they know is right regardless of self? For the sake of others, obviously. Again, altruism or the sake of continued existence as a whole comes to mind.

Faith in selfless Unity for Good.

1.  instinct
2.  social contract
3.  learned behaviors

These are the reasons I treat others with general good will.  There's no such thing as an instinct for prayer, I have no social contract with God, since He offers me nothing, and I have unlearned the cultural fairy tale that would make me feel guilty if I didn't show up at church and say grace every day before dinner.

Altruism makes sense in evolutionary terms.  Wasting time talking to fairy tales does not.