Glad to see that you think Christianity, or a belief in some "higher authority," is the ONLY thing that can create a sense of morality in your eyes. That Dostoevsky wrote it, makes it crazy and possibly applicable to turn of the century St. Petersburg, but probably not necessarily the iron-clad truth. I mean, that dude was CRAZY, albeit philosophically adept.
That Christians think everything is relative as soon as you remove God from the picture reveals just how much they cling to their morality as the only possibility. Open your eyes. Morality and virtue can come from many sources, and that doesn't mean it is necessarily arbitrary. The rule that governs need not be self-gratification (as you seem to equate self-interest with above).