Yes. To quote Jesus Christ (in translation, of course :) "The Sabbath was made for man, not man for the Sabbath." Or to put it another way, you're only hurting yourself.
To be specific, the Sabbath is the last day of the week, so all the Christians who use Sunday both as the first day of the week and as their day of rest are already ignoring the Sabbath.
If you're interested in how that happened, it's to celebrate the resurrection of Christ, which was on the day after the Sabbath (because Jesus was crucified the day before the Sabbath and rose on the third day, the day after the Sabbath). So no matter where you put the Sabbath, Christians will still observe their day of worship on the day after.
To be specific, the Sabbath is the last day of the week, so all the Christians who use Sunday both as the first day of the week and as their day of rest are already ignoring the Sabbath.
If you're interested in how that happened, it's to celebrate the resurrection of Christ, which was on the day after the Sabbath (because Jesus was crucified the day before the Sabbath and rose on the third day, the day after the Sabbath). So no matter where you put the Sabbath, Christians will still observe their day of worship on the day after.