Looking at some non-theological interpretations of materialism that are not as bleak as the existential crisis brought on by pure materialism...
I didn't devote much time to Marxism and its implications, except to note that its value system seems to be decidedly NON-materialistic. Its claims to what is "best" seems self-evident and just built in to the universe. History, both in general and recent, seems to refute many of its claims anyway.
Sociobioloby and its successor, evolutionary psychology, is more recent in developement and much more in vogue among intellectual circles, and deserves a fuller treatment. I'm a strong believer in evolution, and certainly there are many truths in evolutionary psychology. Still, many laypeople are turning evolutionary psychology into something much broader than originally intended, and I'll be going into many misconceptions of same. (Most real evolutionary psychologists are aware of the limitations of their field of study, and several recent statements by such are careful to differentiate between biological altruism and true altruism.) Evolution is prone to many misapplications of its theory and used to justify things that would horrify Darwin himself--from Social Darwinism to SOME (not all, by any means) excesses of sociobiology.
More next time.
Next time: SOCIOBIOLOGY'S SHORTCOMINGS