Crucial importance here . . .
Dominus Vobiscum: Notes from a massgoer's underground
Failure to believe in the Real Presence of Christ in the Eucharist is not the only crisis of Eucharistic faith the Church currently faces.
It is the most well-publicized crisis of faith, because studies have consistently shown a decline in the percentage of Catholics who believe that the Eucharist is truly and substantially the Body and Blood of Jesus Christ. But lack of faith in the sacrificial nature of the Mass is an intimately related crisis of paramount importance.
This failure is at the heart of the happy-meal diversion.