There are layers upon layers in that reward system, although everything should be explainable. So how did the reward system come to a point that it does not want to believe it will die at some point and for that reason it had to create several imaginary stories such as religion etc? I wonder if it maybe has to do with group dynamics? In order for some conscious systems to be controlled by more powerful entities they would have had to been fed delusions in order for their reward systems to be happy and not feel cheated upon. Eg reward system wants to maximize survivability and when it is controlled by other systems in power it has to be led lies that after death it will be better so all in all the reward system gets so skewed that eventually it is likely to believe any other type of delusions as well. Such as for example that itself is not a reward system and if it was it would hate itself.

So in the end are all delusions defense mechanisms for that reward system to accept that things are unfair, this reward system might not be able to achieve the desired goals so it has to adapt itself? But why can't this reward system just hibernate without delusions?

Edit: actually I think coming to hate itself as a reward system is part of societal pressures. Society pressures each reward system to do common good for that society and creates morals. These morals have been created in a manner that one has to be something more than a selfish creature or otherwise gets shunned so reward system will create all those thoughts in order to avoid having to face selfish desires vs societal pressures head on?