I’ve often thought that we drain the lifeblood out of the third part of the phrase - ‘the fellowship of the Holy Spirit’ - by over-spiritualising it. Fellowship in the early church didn’t just mean warm feelings at the coffee hour - it meant that those who had plenty shared with those who had little, so that everyone had enough. It meant that those who were safe went to the aid of those who were in danger. It was a real, practical, bodily-incarnated thing.
He puts me in mind of Leonardo Boff, who has interpreted the Trinity as an essentially political doctrine. Here he is on a proper understanding of the fatherhood of God:
Seeing the divine fatherhood in its true shape, as the Father-Son relationship augmented by the daughter- and sonship of all other adoptive sons and daughters, shows us universal communion, fellowship. Because we are all sons and daughters in the Son, because the eternal Son became the temporal son of Mary through the incarnation, we are all truly brothers and sisters. The Father is never without the Son and these sons and daughters. If we deprive him of this link, then we let in the patriarchal Father, creator of all but himself, solitary and unique, a conception open to political manipulation so as to provide an ideological support for authoritarianism …The patriarchalism and paternalism that have so humiliated the poorthroughout historyare in fact most strongly criticized and most firmly rejected on the basis of the father of Jesus Christ, who clearly said: “You must call no one on earth your father, since you have one Father, and he is in heaven”. Universal daughter- and sonship is the basis for bringing in a society of brothers and sisters, all sons and daughters, united with the only-begotten Son in a communion of love with the Father.
The true religion of the Father always includes the Son and the sons and daughters in the Son thereby preventing authoritarian distortions and oppressive images of `god as absoluteLord, supreme Judge and solitary Father.
Leonardo Boff, Trinity and Society, 1988