The creed said at Mass is different. The Latin rite Roman Catholics say that the Holy Spirit proceeds from the Father and from the Son. The Eastern rite Catholics and the Orthodox say that the Holy Spirit proceeds from the Father.
The Creeds are never different; What you relate to differences are expressions of the one same holy Catholic and Apostolic faith. These differences are minor, not major.
There are no major differences between the Latin Rite, Eastern Rite’s and or Orthodox, when it comes to those things that belong to God in the sacramental economy. It is here where no man can put asunder what God has joined together.
Schism is not a separation or a dividing wall that permanently creates a separation or differences of what is believed in faith from Apostolic Sacred Tradition and what is divinely inspired.
The differences remain in how each ones Apostolic faith is expressed in Liturgy from language, culture and understanding. Neither one faith expression is superior to the other. We have to come to the Truth of each owns Apostolic faith as it was given to each community without change for all ages.
The Eastern Church’s (Catholic) have defended their Apostolic faith against heresies and heretics from their theological understanding that does not change the Apostolic faith. The Popes have approved such clarifications of the Apostolic faith from councils.
The Western Catholic Church has defended her Apostolic faith against heresies, heretics, and secular powers from her theological understanding that never changes the Apostolic faith. Although our Latin faith expression in the filioque = Holy Spirit proceeds from both the Father and the Son. Never changes or adds to the Apostolic faith expressed from both Orthodox Church’s and the Latin Catholic Church.
Contrary to some Orthodox opinions who have engaged and maintain a schism against the bishop of Rome and the Chair of Peter, who would dare to try and make Latin Catholics into Greek Catholics, and in the past Latins have tried to make Greek Catholics into Latin Catholics.
Vatican II has spoken, the Latin Catholics are not to make Greek Orthodox into Latin Catholics. Vatican II’s goal is to acknowledge everything in Orthodoxy to remain Orthodox and not change into Latin Catholics, vice versa.
All other related minor differences of faith expression remains a cause of schism not differences in religion.
The Major subjects relating to schism deals with authority and jurisdiction, not differences of our Christian Catholic faith, which is one Holy Catholic and Apostolic faith.
Opinions relating to the schism; no matter how fierce the language that appears to maintain the schism that introduce differences. These opinions never have the power to divide or separate what God has joined together.
Once we get over the hurdle of respecting and acknowledge each ones expression of the One Holy Catholic and Apostolic faith, without prejudices and false judgments, we can begin the course of Vatican II of not trying to make Latin’s into Greek and Greeks into Latin. Authority and jurisdiction can be ecumenically dialogued to reach a correct biblical and Apostolic Sacred Tradition expressed from each faith community in full communion.
For with God, all things are possible.
Peace be with you