“Christians, too, have an afterlife, but (as I understand it), they do not envision it as the carnal pleasures of this life, only on steroids. It is, instead, a higher form of existence. Moreover, you don’t get there by killing but, instead, by living this life well.”
Um, no. The author is way wrong. You don’t get into Heaven by “living this life well.” You get there by asking Jesus to forgive you of your sins and giving Him control your life. You can’t go there any other way.
Giving Him control over your life is living this life well.