With that as a base to work from, common sense can take you the rest of the way. Eat anything sold at the butcher shop, for instance; you don’t have to run an “idolatry test” on every item. “The earth,” after all, “is God’s, and everything in it.” That “everything” certainly includes the leg of lamb in the butcher shop. If a nonbeliever invites you to dinner and you feel like going, go ahead and enjoy yourself; eat everything placed before you. It would be both bad manners and bad spirituality to cross-examine your host on the ethical purity of each course as it is served. On the other hand, if he goes out of his way to tell you that this or that was sacrificed to god or goddess so-and-so, you should pass. Even though you may be indifferent as to where it came from, he isn’t, and you don’t want to send mixed messages to him about who you are worshiping.