The word Sabbath is a proper noun. All proper nouns are capitalised.
Briefly, part 1 means that only necessary "work" like feeding livestock or dealing with emergencies should be accomplished on the Sabbath; if it is work that can possibly be done beforehand or afterward, do that. Part 2 may be restated "Sabbath rest is to forward--or "promote"--not to hinder Sabbath worship.
Sabbath is not a religion. However, the Sabbath (Friday evening to Saturday evening) is part of the Jewish religion.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
Jews are taught to think of the Sabbath as a gift from God or a beautiful bride. The feeling one is supposed to feel when the Sabbath comes is the feeling a groom has when he sees his bride. The bride is a figure of speech and not a real being. There is only one God.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.