The Test (In Short)

The Sabbath/Sunday test is such a simple one. All will be required, by human law, to keep the Sunday. Yet God requires that we observe the seventhday Sabbath and work on the other six days. We must rest and worship on the Bible Sabbath, and we can do missionary work on Sunday. But we are not to assemble in weekly worship gatherings on that day. The day we hallow will determine what we will receive: the seal or the mark.
- Vance Ferrell, The End of Time, p. 84

Should we obey God, and keep the Sabbath on the seventh day?

Who exactly are you obeying when you keep the Sunday?