As someone who is under 25 years old, I can tell you that this misled belief among many members of the clergy that modernising will engage a broader range of young people in the Church is actually worsening the relationship between the Church and young people. The overwhelming majority of students (even at Catholic schools) perceive the practice of religion, and the concept of Mass etc, as 'cringey' or undesirable or embarrassing to be involved in. It is inevitable that, with a modernist secular society that is becoming increasingly interfaith to an extent where Christians will not be the majority in many Western countries soon, the Church goes back to its pre-Vatican II roots and embrace traditionalism… think about it for a second, if youth are fundamentally repulsed by the idea of practising Catholicism because of social norms, then making the Church 'more modern' to attempt to cater for these young people will be ineffective because it is not so much a liturgical component in which they hold their grievances, it is the entire idea of Catholicism and religion.
Instead, we should be welcoming the young people who go against the grain of society, those who are conservative and old-fashioned or interested in history, because these are the people who would be most intrigued by the Church, especially if it has a traditionalist tint.
Youth who are fully devoted to Christ and His Church are not modernist youth who go out and party every fortnight and listen to rap music 24/7, they're more conservative individuals who are enticed by tradition and an institution (and liturgy) that has a strong sense of historicity and meaning to it which propels them to servility for Christ.
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