JL, although I like your spirit and your knowledge, I think you are incorrect in this statement. We consider the Christian Baptism as valid, and it seals us with the Holy Spirit. So, in my view, you may be going a little overboard with this statement.
From
Catechism of the Catholic Church,
II. The Signs and the Rite of Confirmation
1293
In treating the rite of Confirmation, it is fitting to consider the sign of anointing and what it signifies and imprints: a spiritual seal.
Anointing, in Biblical and other ancient symbolism, is rich in meaning: oil is a sign of abundance and joy; it cleanses (anointing before and after a bath) and limbers (the anointing of athletes and wrestlers); oil is a sign of healing, since it is soothing to bruises and wounds; and it makes radiant with beauty, health, and strength.
**1294 **
Anointing with oil has all these meanings in the sacramental life. The pre-baptismal anointing with the oil of catechumens signifies cleansing and strengthening; the anointing of the sick expresses healing and comfort. The post-baptismal anointing with sacred chrism in Confirmation and ordination is the sign of consecration. By Confirmation Christians, that is, those who are anointed, share more completely in the mission of Jesus Christ and the fullness of the Holy Spirit with which he is filled, so that their lives may give off “the aroma of Christ.”
**1295 **
By this anointing the confirmand receives the “mark,” the seal of the Holy Spirit. A seal is a symbol of a person, a sign of personal authority, or ownership of an object. Hence soldiers were marked with their leader’s seal and slaves with their master’s. A seal authenticates a juridical act or document and occasionally makes it secret.
**1296 **
Christ himself declared that he was marked with his Father’s seal. Christians are also marked with a seal: “It is God who establishes us with you in Christ and has commissioned us; he has put his seal on us and given us his Spirit in our hearts as a guarantee.” This seal of the Holy Spirit marks our total belonging to Christ, our enrollment in his service for ever, as well as the promise of divine protection in the great eschatological trial
Like all sacraments, baptism confers grace upon the believer, just as confirmation does the same. Yet the
spiritual mark, the seal, is different for the sacrament of baptism than the one that is given by the sacrament of confirmation.
Again, from the
Catechism of the Catholic Church,
An indelible spiritual mark . . .
**1272 **
Incorporated into Christ by Baptism, the person baptized is configured to Christ. Baptism seals the Christian with the indelible spiritual mark (
character) of his belonging to Christ. No sin can erase this mark, even if sin prevents Baptism from bearing the fruits of salvation. Given once for all, Baptism cannot be repeated.
**1273 **
Incorporated into the Church by Baptism, the faithful have received the sacramental character that consecrates them for Christian religious worship. The baptismal seal enables and commits Christians to serve God by a vital participation in the holy liturgy of the Church and to exercise their baptismal priesthood by the witness of holy lives and practical charity.
**1274 **
The Holy Spirit has marked us with the
seal of the Lord (“
Dominicus character”) “for the day of redemption.” “Baptism indeed is the seal of eternal life.” The faithful Christian who has “kept the seal” until the end, remaining faithful to the demands of his Baptism, will be able to depart this life “marked with the sign of faith,” with his baptismal faith, in expectation of the blessed vision of God—the consummation of faith—and in the hope of resurrection
Emphases in these quotations was already present.
The “seal of the Lord”, which signifies our belonging to Christ, is the mark we are given by baptism; the seal of the Holy Spirit is what we are given by confirmation.
Such is the progress of the Christians spiritual growth; we are first baptized, which makes us a posession of Christ. Just as the Samarians had not received the Holy Spirit until
hands were laid upon them (cf. Acts 8:14-16), we too must be confirmed in order to receive the mark of the Holy Spirit.