John Hick has long argued that the widespread realization that Christianity is only one among several great world religions calls for a need to rethink Christian doctrine. He himself see the great world faiths as very different and (so far as we can tell) equally valid ways of conceiving, experiencing and responding in life to ultimate reality that we call God, The rainbow, as the sun's light refracted by the earth's atmosphere into a glorious spectrum of colours, is a metaphor for the refraction of the divine Light by human religious cultures.