Ok so, I know some others will chime in but I will start.
Even if the unthinkable happens and everyone is forced to worship on Sunday, what would stop anyone from continuing to keep Saturday as well? I mean, you don't have to go to church on Saturday in order to keep the Sabbath.
This is just HUGE fo SDAs. Yes, we will be prevented from attending services on Saturday, as the churches doors will be locked. Basically, the world will unite un the wings of the RCC, and as a means to bring us all together and save the world from corruption there will be eccumenical harmony with all other christian religions. They will also unite under one doctrine.....everyone except SDAs. We will refuse to worship on Sunday, be blamed for allt he ills of the world, be persecuted, have to run to the hills and mountains to hide. That is it ina nutshell. I am susre someone will come along and cut and paste the details. For those whoa re familiar with it, Jim LaHayes' end time doctrine talks about being persecuted for worhsipping the one true God, and not bowing to the Antichrist. SDAs, claim they only will be persecuted for keeping the Sabbath.
Will you be forced to go to work and watch tv on Saturday?
The is the biggest part. YES, working on the Sabbath is huge! in fact there is the Religious Liberty magazine and deptpartment that currently assists SDAs with the issues of being asked or forced to work on Saturdays. This will somehow be required of everyone. Now, this means that the Sunday Blue Laws, which are already on the books in some states, wil become national and everyone will be required to attend services on Sunday, for the sake of unity and the moral saving onf the nation, etc. To worship on saturday will actually be against the law, hence the closing of churches, and running to the hills and mountains, etc.
And couldn't you just start worshiping on Sunday as well in order to avoid the mark of the beast that will keep you from buying anything? What is wrong with worshiping God every day?
As explained above worshipping on both days will not be acceptable.
I guess a more specific question is, what will the "Sunday Law" do specifically that will force people to break the 4th commandment?
Sunday Laws, when they were enforced basically said that everything had to close down on Sunday. No stores/businesses open at all. they didn't require that you went to church, but if you thought you were going to need something, you had beter get it on Saturday, cuz Sunday you were out of luck.
Soo, I hope this helps some. As I said, I am sure someone else will be along soon to give you the long version.