Suprise, suprise! ...there is no
New Testament basis for
requiring one particular day of the week to be set above the rest for anything. Not one.
The New Testament (NT) teaches that the Old Testament law, including Sabbath keeping, has been
fulfilled (past tense) in Christ, who perfectly kept the law for us, and whose merit in this we can enter into so as to receive its merit by grace through faith in Him. This is, in synopsis, the whole Christian faith: Christ was perfect, we are not; He paid the price to atone for our imperfectness, and we can become recipients of HIS merit and not have to stand before God with OUR OWN merit, which will always fall short because God's standard is perfection and we CANNOT meet that standard on our own.
This does not mean Christians can now "live like the devil," of course, but means we are free to, in the termiology of the NT, "walk in the Spirit," and thereby, "not fulfill the lusts of the flesh." We are not to, "continue in sin that grace may abound."
The New Testament teaching regarding the laws that Christians must live by, very simply, is this: "The entire law is summed up in a single command: 'Love your neighbor as yourself'" (Galatians 5:14). Not a very long list, eh?!
There are commands, not laws, of Christ, that essentially repeat the same thing. As well, there are Apostolic commands--again, most saying pretty much the same thing. Beyond these, one pertinent Apostolic command was directed at Jewish Christians just prior the 70AD destruction of Jerusalem. They were experiencing murderous persecution at the time for being Christians, and were commanded to not "forsake the assembling together." However, note the word forsake:
To leave altogether; abandon. Also note the complete absense of saying WHEN they should assemble together, and HOW OFTEN. The level and circumstance of this NT passage would not even remotely apply to a physician who might be on call to save life one week or so out of four, or even being on call 24/7. The spirit and circumstance of it is altogether different.
For the most part, the church in her history simply decided
for convenience sake to make Sunday the day to meet. Paul in 2 Corinthians also mentions one day
as a matter of convenience for the Corinthians' giving money to a particular collection for those same Jewish Christians just mentioned, who were essentially squeezed out of the 1st century economy of their area and were just not making it. There is also the mention in Romans 14 of how some spiritually young Christians had their quirks, and held one day above another; but the Apostle Paul in this situation simply addresses the larger church that these people were in and asks them to not ostracize them for these quirks, but to accept them and let them mature. Beyond this, there is nothing more in the NT regarding the matter of one day above the rest. Christians do very well to leave it off right there, as well.
My church, for convinience sake, holds Tuesday during lunch service--they serve lunch while the pastor shares a message--Wednesday evening service, Saturday night services, and early and late Sunday morning services. The church down the road adds Tuesday and Thursday evenings, and Friday nights to their line up!!! Any Monday takers out there?!?!
