Book of Contradictions: A Challenge

[Ateo]

Doesn't it say somewhere in the bible to 'remember the sabbath and keep it holy'. That would therefore refer to a Saturday by biblical tradition. So if the change to sunday occurred during the reformation isn't that an arbitrary decision by the catholic church.
We all know what went on during the reformation, viz the Spanish Inquisition, so would the real reason be to change the 'sabbath' to sunday be one of the ways to ascertain somebody's jewishness as we know what happened to many innocent victims who were persecuted for celebrating the 'sabbath' on saturdays.
So it could be that the change occurred on someone's whim and that when the bible refers to the 'sabbath' xtians should by biblical standards celebrate saturdays.