Ways with words ch. 4

What assumptions can we make when interpreting an ethnographic study? This is the question that I found myself asking as I read Chapter 4 in Ways with Words. Consider for a moment "Rattles, in blue or pink, stuffed animals, 'busy boxes' . . . mobiles, and wall plaques on a religious theme or illustrating nursery rhymes are favorite items" (p. 114). In this passage, Heath is describing the items that people bring, most often, to baby showers. But what assumptions can we make? Are the items centered around "religious themes" predominantly Christian? Can we, as the reader, assume that these "religious themes" are of a particular religion?