Modern man, in so far as he is still Cartesian (he is of course going far beyond Descartes in many respects), is a subject for whom his own self-awareness as a thinking, observing, measuring and estimating "self" is absolutely primary. It is for him the one indubitable "reality," and all truth starts here. The more he is able to develop his consciousness as a subject over against objects, the more he can understand things in their relations to him and one another, the more he can manipulate these objects for his own interests, but also, at the same time, the more he tends to isolate himself in his own subjective prison, to become a detached observer cut off from everything else in a kind of impenetrable alienated and transparent bubble which contains all reality in the form of purely subjective experience. Modern consciousness then tends to create this solipsistic bubble of awareness - an ego-self imprisoned in its own consciousness, isolated and out of touch with other such selves in so far as they are all "things" rather than persons.
It is this kind of consciousness, exacerbated to an extreme, which has made inevitable the so called "death of God." Cartesian thought began with an attempt to reach God as object by starting from the thinking self. But when God becomes object, he sooner or later "dies," because God as object is ultimately unthinkable. God as object is not only a mere abstract concept, but one which contains so many internal contradictions that it becomes entirely nonnegotiable except when it is hardened into an idol that is maintained in existence by a sheer act of will. For a long time man continued to be capable of this willfulness: but now the effort has become exhausting and many Christians have realised it to be futile. Relaxing the effort, they have let go the "God-object" which their fathers and grandfathers still hoped to manipulate for their own ends. Their weariness has accounted for the element of resentment which made this a conscious "murder" of the deity. Liberated from the strain of willfully maintaining an object-God in existence, the Cartesian consciousness remains none the less imprisoned in itself. Hence the need to break out of itself and to meet "the other" in "encounter," "openness," "fellowship," "communion".