By they, do you mean those who crucified Jesus? If so, you might have a point. The Jewish calendar considers Sunday the first day of the week, making Friday the 6th day.
The Church fathers saw a certain fittingness to Christ accomplishing the work of salvation on the 6th day, then resting, in a sense, on the 7th day.
They chose Friday because it is the 6th day of the week. Six is an important number for Satanists.
By they, do you mean those who crucified Jesus? If so, you might have a point. The Jewish calendar considers Sunday the first day of the week, making Friday the 6th day.
The Church fathers saw a certain fittingness to Christ accomplishing the work of salvation on the 6th day, then resting, in a sense, on the 7th day.
The one thing arguing against this is that the sabbath was a special sabbath due to the Passover holiday.