I don't know what you believe in but I gonna go ahead with my answer anyway.
If we take for instance that Paradise exists,then it means there we live satisfactory and in happiness.
If we end up in hell we live in a state of constant sadness.
So what is earth?Something of both,although Adam and Eve were thrown here as a penalty,they lost their hapiness,the beauty of paradise and their eternal life.In earth they had to face death,illnesses,demons and all those for their action.Also the world lacks ultimate justice so it is also unfair,that's why you see that there's no equality in what you are asking for.
As for praying I don't think it necessarily means beggining,except if done excessively it means that the person praying like that expects everything ready and to be handed to him,also unable to face the world.
Praying is mostly a form of expression and connection to spirituality I'd say and a way to give us hope.
Like I said though I don't know what you believe in so I gave you an answer related to Christianity.