Yes or No; Sunday Laws are Constitutional.
The answer is "Yes."
"On May 29, 1961, the Supreme Court of the United States decided that Sunday laws are constitutional. In an outstanding manner, an associate justice of the Supreme Court of the United States is made to echo the words of the servant (Ellen White) of God in order to state his dissenting to the opinion of the court on Sunday laws: 'For in his case the Court seems to say, without so much as a deferential nod toward that high place which we have accorded religious freedom in the past, that any substantial interest will justify encroachments on religious practice, at least if those encroachments are cloaked in the guise of some nonreligious public purpose.'" ...Justice Brennan, Braunfield v. Brown, May 29, 1961.
[Source] Preparation For The Final Crisis; Fernando Chaij, pg. 180.8, Pacific Press Pub. 1966.
Note: This book is still in publication and is available through ABC.
Think more deeply on these things. e.c.