As for the "Holy Days", Seventh-day Adventists note that the apostolic church never gave attention to either the date of Christ's birth or the date of His resurrection, other than to note that the latter occurred on a Sunday. Neither of these days was observed by early Christians but as the pagan influence came into the church so did its festivals. The Roman Catholic church changed the Biblical Passover to the festival of Easter causing the Quartodeciman controversy and in the Council of Nicaea (AD 325) set a formula for when it was to be observed still followed to this day, which cannot possibly be commemoration of the actual resurrection or sanctioned in scripture. So that now Easter always falls on a Sunday, and although the resurrection of Jesus is a historical event of huge importance, there is no biblical precedent for making Easter a special day of celebration.