>>757103
I don't think so completely, these devils are more conspiring to make him proud and unthinking. He likes the people because of the girl, the sex entices him to like what she likes but of course now the devils are seeking to make him believe that the people she knows are no different than he is.
What they really want him to agree to, is not that he's doing anything for sex, but that he doesn't have to do anything for Christ. Really CS Lewis is saying that the devils are trying hard to make a nominal Christian; if they can make him proud of himself, and say such things as that he's always been a Christian because he's a "good person," or that other people who've worked hard to refine themselves spiritually are "like him." These devils reason that this is the easiest way to make the central character the ultimate sloth in doing God's will. He will be an outward Christian, and an inward zero, and will hopefully never know the difference.