God, I have said, is the fulfiller, or the reality, of the human desires for happiness, perfection, and immortality. From this it may be inferred that to deprive man of God is to tear the heart out of his breast. But I contest the premises from which religion and theology deduce the necessity and existence of God, or of immortality, which is the same thing. I maintain that desires which are fulfilled only in the imagination, or from which the existence of an imaginary being is deduced, are imaginary desires, and not the real desires of the human heart; I maintain that the limitations which the religious imagination annuls in the idea of God or immortality, are necessary determinations of the human essence, which cannot be dissociated from it, and therefore no limitations at all, except precisely in man’s imagination….
Man has many wishes that he does not really wish to fulfil, and it would be a misunderstanding to suppose the contrary. He wants them to remain wishes, they have value only in his imagination; their fulfilment would be a bitter disappointment to him. Such a desire is the desire for eternal life. If it were fulfilled, man would become thoroughly sick of living eternally, and yearn for death. In reality man wishes merely to avoid a premature, violent or gruesome death. Everything has its measure, says a pagan philosopher; in the end we weary of everything, even of life; a time comes when man desires death.
- Will Religion Die Out Once We Become Immortal? (arizonaatheist.blogspot.com)