I hope not - I work on Sundays. I don’t believe it is a sin (will be interested to read other replies). We are to go to Church on Sunday (obligation) and spend time focusing on God and I try to study scripture each Sunday.
But - Sunday is not the mosaic Sabbath (that remains Saturday, but is fuliflled in Christ - (see Hebrews) and thus the Mosaic law restrictions on ceasing from work do not apply. Sunday is the celebration of the resurrection of the Lord - a day for worship in Church and fellowship - but does not carry over restrictions on work, etc.
Some Protestant denominations treat it as the Sabbath and carry over these restrictions.
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