It appears that there has been a radical change in timing and significance of the resurrection of Jesus Christ from the dead. According to The International Standard Bible Encyclopedia, "Among early Jewish Christians the time of the observance was determined by the date of the Hebrew Passover festival. Gentile Christians, however, tended to celebrate the Resurrection on Sunday." (Page 6)

In view of the consistent distinction between "resurrection" and "post-resurrection" appearances that can be carefully observed in the New Testament, there is no doubt that the action by the Gentile Christians is a flagrant violation of the timing and significance of resurrection!