From a reader:
A priest (not the pastor) in my suburban ___ parish changed the words in Eucharistic Prayer IV to reflect inclusive language. ‘You formed man’ became ‘You formed us.’ And he prayed, [You] ‘entrusted the world to our care, so that … we might have dominion over all creatures,’ instead of ‘his care’ and ‘he might have,’ etc. In doing so, did Father really say Mass? I know the usual advice is tell the pastor and if he doesn’t address it, tell the bishop, but I wonder how serious a problem this is as far as the legitimacy or validity of the Mass.
Here’s the bottom line.
Priests may not on their own authority change the words of the liturgical texts when there is not rubric which says they can use other words.
So, NO, that priest is committing a liturgical abuse.
I direct you to Redemptionis Sacramentum.
6. Complaints Regarding Abuses in Liturgical Matters
[183.] In an altogether particular manner, let everyone do all that is in their power to ensure that the Most Holy Sacrament of the Eucharist will be protected from any and every irreverence or distortion and that all abuses be thoroughly corrected. This is a most serious duty incumbent upon each and every one, and all are bound to carry it out without any favouritism.
[184.] Any Catholic, whether Priest or Deacon or lay member of Christ’s faithful, has the right to lodge a complaint regarding a liturgical abuse to the diocesan Bishop or the competent Ordinary equivalent to him in law, or to the Apostolic See on account of the primacy of the Roman Pontiff. It is fitting, however, insofar as possible, that the report or complaint be submitted first to the diocesan Bishop. This is naturally to be done in truth and charity.
So, I would start by contacting the pastor. First, in a brief chat. Then, if that doesn’t work, with a letter. Keep copies of everything. If that doesn’t work, write to the local bishop. If that doesn’t work, then send the whole thing to the Congregation for Divine Worship.