I’ll begin with a disclaimer … some could find some of my remarks heretical, but I am going to preach them anyway.
In 1054 of the Common Era the Christian Church in the East split from the Christian Church in the West. This split is called the Great Schism and the two churches became known as the Roman Catholic Church in the West, and the [Greek] Orthodox Church in the East. The schism was over whether the Holy Spirit “proceed
ed” from just the “Father” or from both the “Father and Son.” In Latin it was one single word … “filioque.”