How does the author use metaphor in the poem, Island of the Three Marias?

The "scars" in the first quatrain are suggestive of the scars of Christ on the cross; the "Easter lilies" in the second quatrain suggest Christ's resurrection; and the "story of the child martyrs" and the "stale candies said to be blessed" in the last quatrain attest to the ongoing presence and importance of belief, however conceived, and how it is passed down from one generation to the next.