"BE HONEST" ???
Are you talking of "END TIMES/BIBLE PROPHECY" forum index or of todays Sunday Worship?? There is a complete difference! See Rev. 14:6-10.
With trying to be non/offensive, let me say without a doubt, this is where some of us find others VERY confusing. Man cannot be held accountable for what he does not know!
First: There is no law to enforce Sunday worship USA/wide, or world/wide. The Mark of the Beast [will] quaranteen & finally kill. Will there be a Sunday law of enforcement in the furture? that is not your question. If it were, then one could 'see' the complete picture perhaps?
Your question as stated comes across as perhaps as trick question. Let me explain? There are people dieing daily who will be saved who worship on Sunday! Are they taking the Mark of the Beast? Hardly!
Maybe you could rewrite your question after reading 2 Cor. 4:2 so as it will not sound like 'some' are saying that Sunday keepers are ALL going to hell? OK?
Next: Rom. 8:14 tells us that God LEAD'S HIS SAINTS! So, surely they will be held accountable for (only) what knowledge He has given to them. How many times will He LEAD us to Truth, after that?? (you for instance??) Try Rev. 18:4?? Are these being 'Led' of the Holy Ghost, once they have this knowledge? And, is this by force too? Check out John 9:39-41.
The bottom line testing is not the Mark of the Beast. It is the Everlasting Gospel of Rev. 14:6 first part! The 666 is the last TEST for a world of 'professed believers'. (MATURELY FINISHED as in James 1:15) The REAL TEST HAS ALWAYS BEEN, who does a person [truely] LOVE? And this is an ETERNAL GOSPEL WITH COVENANT CONDITIONS TESTING. And the ONLY ones that will not take the Mark of the Beast, will be the ones that He has said.. "IF YE LOVE ME KEEP MY COMMANDMENTS". Simple huh?
One thing that is for certain is, that of all the denominations the world over, most of them have unity on ONLY ONE thing! What is that? And as ALL HELL IS BREAKING LOOSE, what do you think that these ones will do to stop the judgements of God??
Take care! --John