In Myths To Live By, the great scholar of comparative religions, Joseph Campbell, writes: "...there has dawned [in the human brain] a realization unknown to the other primates. tt is that of the individual, conscious of himself as such, and aware that he, and all that he cares for, will one day die. This recognition of mortality - and the requirement to transcend it - is the first great impulse to mythology."
As far as I can detemine, for Campbell, the two terms - mythology and religion - are synonomous. So, to say that the recognition of mortality is the first great impulse to mythology is tantamount to saying that it is the first great impulse to, and basis for, religion. According to Campbell, the inevitability of death - and the desire/psychological imperative to transcend it - is the first great impulse toward mythology (religion). If one accepts this thesis, I believe that one would be hard-pressed to find a religion/mythology that did not have some conception of an after-life.
According to Campbell, there runs a second realization which provides an impulse toward mythology - namely the recognition on the part of an individual of the endurance of the social order into which he/she is born. That is to say that every person comes to the realization that the social group into which he/she has been born "was flourishing long before his/her own birth and will remain when he/she is gone."
In other words, every person must face the ultimate reality of death, he/she also confronts the necessity of adapting him/herself to whatever order of life may happen to be that of the community into which he/she has been born. Each person has a dual awareness - an awareness of him/herself as an organism, and an awareness of his/her community as a superorganism, a superorganism into which a person must allow him/herself to be absorbed, and through participation in which he/she will come to know the life that transcends death.
And finally, for Campbell, there is yet a third great impulse to mythology, "the, spectacle, namely, of the universe, the natural world in which [a person] finds himself, and the enigma of its relation to his own existence: its mgnitude, its changing forms, and yet, through these, an appearance of regularity."
I view Being itself as absolutely the greatest enigma of all. I am stupified and utterly confounded whenever I contemplate it. I am a finite being who opens onto infinity. I am an ephemeral being who opens onto eternity. I am a relative being who opens onto the absolute. Not only I am baffled be the idea of infinity, I am also baffled when I contemplate my own finitude. I am baffled both by the idea of eternity and the idea of my own ephemeralness. I am confounded and perplexed when I try to reconcile my relative existence with the idea of the absolute.