I agree with your argumentation. Besides, in the 1st century it was rather unusual to have only one or even two children as it is a standard nowadays. I am sure Mary, the mother of Jesus, had more children after her firstborn son. James, in later days called James the Just, was Jesus’ younger brother. He was the leader of the Jewish-Christian community in Jerusalem after Jesus’ death and Ascension. James was so respected exactly because he was himself the brother of the Lord. Altogether Jesus had four brothers and a few sisters. How many, we don’t know. The Bible doesn’t tell us. Women were not that important at that time, so they are rarely mentioned in scriptures.
You list your religion as “Roman Catholic” but by failing to believe official Church teaching that Mary was ever Virgin as taught in CCC499-500 …
499 The deepening of faith in the virginal motherhood led the Church to confess Mary’s real and perpetual virginity even in the act of giving birth to the Son of God made man. In fact, Christ’s birth “did not diminish his mother’s virginal integrity but sanctified it.” And so the liturgy of the Church celebrates Mary as
Aeiparthenos, the “Ever-virgin”.
500 Against this doctrine the objection is sometimes raised that the Bible mentions brothers and sisters of Jesus. The Church has always understood these passages as not referring to other children of the Virgin Mary. In fact James and Joseph, “brothers of Jesus”, are the sons of another Mary, a disciple of Christ, whom St. Matthew significantly calls “the other Mary”. They are close relations of Jesus, according to an Old Testament expression.
… you are considered a
heretic as defined by Church Canon 751 …
Heresy is the obstinate denial or obstinate doubt after the reception of baptism of some truth which is to be believed by divine and Catholic faith; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Supreme Pontiff or of communion with the members of the Church subject to him.
… and are AUTOMATICLY
excommunicated from the Catholic Church as declared in Canon 1364 §1 … “an apostate from the faith, a heretic, or a schismatic incurs a latae sententiae excommunication.”
… The phrase “latae sententiae” means a judgment or sentence which has already been brought, in other words, a sentence or judgment which does not need a future additional judgment from someone in authority; it refers to a type of excommunication which is automatic. Such a sentence of excommunication is incurred “by the very commission of the offense,” (CCC 2272) and does NOT require the future particular judgment of a case by competent authority.