That's one opinion but not really in-line with biblical teaching.
http://www.gotquestions.org/Saturday-Sunday.html
There is no one verse that says Sat./Sun.; not that it really matters what day anyway.
I would then ask, can we nullify the rest of the 10 commandments? After all, they were given to Israel, not gentiles. Or are we now to pick and choose among them which ones we are going to follow, only choosing of course the one's that are in line with current moralities and are convenient for us? What about the fact that when Christ came to earth, he stated "I am not to take away one jot or tittle from the law". There is indeed a verse that claims that the 7th day is the one for rest, it is right there with the other 9 commandments that people observe.
Reading further in your link, I discovered the one text (again, same as from our dietary debate) that does support worshiping whenever you think you should. However, it goes to state that you should be *fully convinced in your mind*. What that means is that you are following God to the BEST of your ability. It means that, assuming I am correct and Sabbath is Saturday, yet you worship on Sunday because you believe it is correct, (or it is Sunday, and I am wrong), that neither of us should burn in hell, because we did what we *knew* to be right in the eyes of God. It is simply saying that Christ will not judge us for our ignorance. Thankfully for Christians, this is a good thing, because if God is real, I highly doubt ANYONE is 100% spot-on in all their beliefs.
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