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"You may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday, a day which we never sanctify." Cardinal Gibbons (for many years head of the Catholic Church in America), The Faith of Our Fathers (92d ed., rev.; Baltimore: John Murphy Company), p.89.

Colossians 2: 16 Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. 17 These are a shadow of the things that were to come; the reality, however, is found in Christ.

Romans 14:5 Some consider one day more sacred than another; others consider every day alike. Everyone should be fully convinced in their own mind. 6 Those who regard one day as special do so to the Lord. Those who eat meat do so to the Lord, for they give thanks to God; and those who abstain do so to the Lord and give thanks to God. 7 For we do not live to ourselves alone and we do not die to ourselves alone. 8 If we live, we live to the Lord; and if we die, we die to the Lord. So, whether we live or die, we belong to the Lord. 9 For this very reason, Christ died and returned to life so that he might be the Lord of both the dead and the living.

Acts 20:7 On the first day of the week we came together to break bread. Paul spoke to the people and, because he intended to leave the next day, kept on talking until midnight.

Cardinal Gibbons is not "head" of the Catholic Church in America any more than his successor as Cardinal Archbishop of Baltimore Bill Keeler is.

The Pope is the head of the Catholic Church.

Acts 20:7, of course, shows that Christians gathered on the first day of the week for the breaking of the bread and to hear the Word preached.

And, of course, the Resurrection itself is Scriptural ground enough to keep the first day of the week holy.