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The EucharistIntermediate

Did the Church change the Mass to make it more acceptable to Protestants?

The Eucharist

The short answer

No. The reform's primary concern was the active participation of Catholic laity. Vatican II did list fostering Christian unity among its reasons, but not first — and unity is a valid concern, given how much Jesus valued it.

The Council's aims

Vatican II sought to invigorate the Christian life of the faithful, adapt changeable institutions to modern needs, foster union among all who believe in Christ, and help call all humanity into the Church; hence it undertook liturgical reform (Sacrosanctum Concilium 1).

Not the first reason

Christian reunion is among the reasons, but not the first. The primary concern was the active participation of the laity.

Still valid

Even so, Christian unity is a legitimate concern, given the importance Jesus placed on it (John 17).