Sabbath, Sunday or The Lord's Day? Is there a difference? Is this a new argument?

If Sunday is the Sabbath then part of the Christian Church is living in wholesale disregard to the will of God and is under his condemnation. If the Sabbath is no longer binding on the Christian then sections of the church are guilty of Pharisaism and are adding extra rules to Christ's teaching.

What was Calvin's viewpoint?