What makes the selection sound like contemporary Christian music? How does the selection exemplify ...

The snappy rhythms with off-beat syncopations give the hymn a strong Christian praise song flavor in contemporary pop style.
 The Cantonese lyrics and its pop music style show its aptness for use in Hong Kong.
 Nevertheless, even a song like this one employs Chinese cultural featureslyrical structure and images (opening lines of seven syllables/earth and sky opening image suggests a combination of opposites/details of images rather than the full rendition)
 Syllabic melody/text  one pitch per syllable of text (versus melismatic  several pitches per syllable) makes text easy to hear and sing together. Repeating, simple melody in a limited melodic range also makes it easier for church use with a musically untrained congregation. The entire congregation is singing the same melody together in unison.