So these posts seemed oddly familiar to me, so I looked into it and found out this isn't the first time you posted it. You posted all of this stuff, nearly word for word, in an earlier topic about two years ago, as may be seen here:
Are you saying that Sunday observance did not occur until after 336 AD? It's recorded history, saying what it says.
www.christianforums.com
(the only changes I see is, in the second post quoted, the addition of "you see" at the start and the addition of the last paragraph)
Back then, people corrected you on errors you made. And yet here you go again, posting the exact same thing without even taking the slightest effort to correct anything. Thus, these errors cannot be ascribed to simple ignorance, as you are re-posting them exactly despite people pointing out the problems. Not only that, people asked for evidence for several claims you made, which you did not provide. But now, with two years to have found it, you still aren't posting evidence, you're just making assertions without evidence. Granted, you may have just copied this stuff from someone else anyway, but to just post it all again, with no supporting evidence, as if you haven't already had people point out errors and ask for evidence, is rather problematic.
As this was already responded to back then, as someone can see at the link, there isn't too much to really say to it. But I still want to respond to a few things in particular.
Ample evidence from history shows that the celebration of Sunday originated from pagan practices of SUN WORSHIP. In March of 321 A.D., the Roman Emperor Constantine, who was at first a sun-worshiper and later a Christian convert, issued the first decree declaring Sunday to be a legal day of rest. In 336 A.D., the Roman Catholic Church officially changed the observance of Sabbath to Sunday for political and economic expediency. Since then, the original Sabbath gradually gave way to Sunday observance and the practice remains to this day.
Well, despite the claim of "ample evidence" you don't offer any, either in the initial post or the second one. Indeed, how about you offer evidence for this claim that "In 336 A.D., the Roman Catholic Church officially changed the observance of Sabbath to Sunday for political and economic expediency". You've had two years to find it--would you share it with us?
You see, in the Council of Trent (1545 A.D.), the church leaders ruled that "tradition" is of as great authority as the Bible! They believed that God had given them the authority to change the Bible any way they pleased. By "tradition" they meant human teachings.
What in the world the declarations of a council from the 16th century is supposed to show about things that happened over a thousand years before, I am unsure. However, your claim that "by "tradition they meant human teachings" is simply false. They do not regard their Tradition (despite the same name, not really the same concept as a regular tradition) as "human teachings" but rather divinely inspired. Undoubtedly you, not being a Catholic, do not agree. But to claim they
meant human teachings is simply absurd.
The sun was the main god of the heathen even back as far as ancient Babylon. Since they worshiped the sun on Sunday, the compromising church leaders could see that if they changed the Sabbath from Saturday to Sunday, it would accomplish several things.
A fascinating claim that they worshipped the sun on Sunday and that it was a day of importance to pagans... but once you do not provide evidence for. Again, it was requested in that topic that you provide evidence of it, but you didn't. Can you show us what evidence you've found in the intervening two years that make you feel sure enough about this to re-post it?
When Emperor Constantine became a Christian, Christianity became the state religion you remember.
I don't remember that, because it's not true. But do you not remember the fact you were corrected on this fact by multiple people (including myself, actually)? Constantine did not make Christianity become the state religion.
The claim that Constantine made Christianity the state religion is, admittedly, a popular misconception. It's not good when people post such things as fact, but at least they may simply be ignorant of the facts. However, you were corrected on this and still post the exact same error.
The pagan festival finally came to be regarded as the "Lord's day" (by Pope Sylvester, 314-337 A.D.) and the church leaders pronounced the Bible Sabbath a relic of the Jews, and those who honored it, in obedience to the fourth commandment of God, were pronounced to be "accursed."
Pope Sylvester may have seen it as the Lord's Day, but to say he started it is ridiculous. For example, Cyprian (a century beforehand) uses it to refer to Sunday in Epistle LVIII:
"For because the eighth day, that is, the first day after the Sabbath, was to be that on which the Lord should rise again, and should quicken us, and give us circumcision of the spirit, the eighth day, that is, the first day after the Sabbath, and the Lord’s day, went before in the figure; which figure ceased when by and by the truth came, and spiritual circumcision was given to us."
Source:
Philip Schaff: ANF05. Fathers of the Third Century: Hippolytus, Cyprian, Caius, Novatian, Appendix - Christian Classics Ethereal Library