should you keep the weekly sabbath?

IN THE late 1980’s, small groups of Methodists laid siege to Suva, the capital city of Fiji. Men, women, and children—all dressed for church—manned 70 roadblocks. They stopped all commercial traffic as well as domestic and international flights. What prompted that action? A demand to make the nation return to strict Sabbath observance.
In Israel, every new multistory building erected since 2001 must have at least one elevator that automatically stops at each floor. For what purpose? So that devout Jews, who observe the Sabbath from Friday evening until Saturday evening, do not have to do the “work” of pressing the buttons in an elevator.
In Tonga, a kingdom in the South Pacific, all work is forbidden on Sunday. No aircraft is allowed to land, and no ship is permitted to dock. Any contracts signed on that day are not viewed as valid. The constitution of Tonga requires that Sunday be “kept holy” by all, regardless of a person’s religious beliefs. Why? To ensure nationwide observance of the Sabbath.
As the above examples show, many people feel that God requires them to keep a weekly Sabbath day. In fact, some say that Sabbath-keeping is of utmost importance, believing that it involves our eternal salvation. Others feel that the most important commandment from God is to keep the Sabbath. What is the Sabbath? And does the Bible urge Christians to observe a Sabbath day each week?