"Most churches do not call it the Sabbath, but call it the Lord's Day."
That could be debatable. :) Sunday referred to as "the Lord's Day" is extremely common, no doubt. And of course as Loquat pointed out, the early church fathers referred to Sunday as "the Lord's Day". But it seems like I've equally heard Christians call it "the Sabbath". It probably depends on what denominations you are around more. I've been around a lot of Reformed Baptists churches as well as Presbyterian churches and those churches fall into category #1 of that article I posted, which is the Sunday-Sabbath view so I often hear in those denominations Sunday called "the Sabbath" but they also call it "the Lord's Day." They are confused but don't know it. :)