Catholic conversion “trends” depend heavily on what you mean by conversion—e.g., people becoming Catholic, Catholics adopting “evangelical” sensibilities, or baptisms (which include infant baptisms and therefore do not measure adult conversion on their own). The material you provided suggests a mixed picture: worldwide Catholic membership is still growing, yet baptisms have declined, while sociological discussion points to younger Catholics who show increasing interest in evangelical themes like Scripture, history/liturgy, and stronger identity boundaries—often through processes that look less like “return to the past” and more like forming a new religious self-understanding.1 2 3 4

1) What the trends seem to show (and what they don’t)

A. Broad “religious reconfiguration”: evangelical + Catholic overlap

William Portier describes a “striking evangelical-Catholic confluence” in which significant numbers of younger Catholics catch “evangelical fire,” while “younger evangelicals” (in a corresponding movement) return to “history, liturgy, and a sense of the church as a visible witness.”4 He also connects this to an “evangelical impulse” within Catholicism, broader than—but historically related to—Catholic Charismatic Renewal.5

B. From “return/restoration” to “identity”

Portier’s sociological reading emphasizes that these younger Catholics may not be seeking simply a restoration of earlier Catholic patterns, but rather identity: building a coherent self and community amid American pluralism.6 That matters because it implies a different kind of pastoral strategy than “go back to how things were,” even if some “traditional” emphases are present.6 7

C. Worldwide sacramental-baptism data: membership can rise while baptisms fall

The provided Vatican/Fides statistics indicate:

• Catholic population increased in recent yearly snapshots (with increases across continents, while Europe shows decreases).2 8
• Baptisms declined globally from 1998 to 2022.1

This means “conversion” cannot be read directly from membership growth alone, and baptisms (especially in a global dataset) cannot be treated as a clean proxy for adult conversion.1 2

2) Causes: grace, disappointment, community encounter, and cultural conditions

Your sources point to both inward and outward causes, and also to social conditions that shape how conversion narratives unfold.

A. Inner grace plus an external ecclesial encounter

Kereszty describes conversion as having:

• an inner working of grace (inward sensitivity to recognize Christ), and
• an external, visible encounter with the Church through members or communities.9

So even when the pathway begins with a private experience, it matures only when the person finds a concrete ecclesial setting that persuades them of Christ’s presence.9

B. Disappointment with “everything else” and desire for “a larger horizon”

Snow’s account (in a discussion of conversion motives) portrays many converts as coming because other life-horizons feel too small:

• work/family/other religious options have not sufficed,
• relationships may be wounded,
• and the convert begins to understand that natural affections need ordering to eternal realities.10

This culminates in attraction to Catholic religious life, prayer, priestly witness, peace, and a “larger context” for life.10

C. U.S. social context: individual choice, relativism, and wounds that push people away

On the disaffection side (which affects the “conversion ecosystem,” since it changes who leaves and who stays), the U.S. bishops cite factors like:

• a cultural emphasis on individual choice that can eclipse community/common good,
• the sexual abuse crisis,
• political polarities and uncertainty,
• and “relativism” that makes preaching “enduring values” harder.11

While this is not a conversion-cause study per se, it helps explain why conversion patterns may diverge: some experience the Church as wounded and leave; others—by contrast—may be drawn to Catholic clarity, community, and truth amid uncertainty.11

D. American pluralism as a sociological enabling condition

Portier explicitly frames the emergence of evangelical forms of Christianity (including evangelical-Catholic confluence) through the “ambivalent dynamics of American pluralism,” where voluntary religious forms become possible.4 He also suggests post-subculture conditions can produce new types of Catholics rather than a simple “downward trend” or a straightforward “rebound effect.”7

3) Demographics: who shows up in these accounts?

A. Age cohort: under-40 and post–Vatican II Catholics

Portier reports sociological findings in which Catholics “under forty”:

• generally like being Catholic,
• tend to agree with core beliefs stated in the Nicene Creed,
• but often lack experience of Catholicism as a tight-knit culture system.3

He distinguishes “pre-Vatican II,” “Vatican II,” and “post-Vatican II” cohorts (the last being those born after 1960), with “young adult Catholics” receiving the label used in those studies.3

B. Religious-identity pattern: “spiritual and contingent” Catholics

One of the most striking demographic claims in Portier’s summary is that many young adults view Catholicism less as an integrated ecclesial way of life and more as a “cultural tool kit” for constructing personal religious identity.3

That aligns with his description of weak ecclesial commitment and minimal “ecclesial dimension” to being Catholic.3

C. Within-younger-Catholics: a meaningful minority with “traditional beliefs and practices”

Portier reports results from the Davidson/Hoge research framework as he discusses it:

• 30% of under-forty Catholics scoring high on a “traditional beliefs and practices index” (as quoted in his narrative),3
• 37% scoring high on that index (in another place in his discussion), and6
• an additional reported result that 14% strongly disagree you can be a good Catholic without going to Mass.7

He also says (based on “experience,” i.e., not a controlled study) that it is among this sizeable minority that you may find disproportionate representation among “undergraduate theology majors, parish youth ministers, and graduate students in theology and ministry.”6

Important caution: these are reported through secondary discussion and survey summary, so the demographic “who” is suggestive but not definitive.6 7

D. Conversion-direction diversity: not just “Catholics to Catholicism”

Portier emphasizes that “evangelical Catholic” dynamics form a spectrum:

• Roman Catholics who become evangelical Protestants,
• evangelical Protestants who become Roman Catholics (including a subset he mentions as ERCs),
• and Catholics adopting evangelical sensibilities from within Catholicism.5

So if you’re assessing “conversion trends,” you must separate directionality (to Catholicism vs. from Catholicism vs. internal shift in Catholic identity) because the drivers likely differ.5

4) Data reliability: where the evidence is strong, and where it’s fragile

A. Strength: Vatican/Fides counts are consistent over time—but not a direct conversion metric

The Vatican/Fides numbers provide credible global time-series for:

• Catholic population changes by continent/year snapshots,2 8
• and total baptisms worldwide, with an observed decline from 1998 to 2022.1

However, reliability for adult conversion trends is limited because “baptisms” include many non-converts (especially infants) and do not isolate conversion by faith commitment.1

B. Reliability challenges in sociological conversion/identity data

Portier’s demographic interpretation relies on surveys (Hoge/Davidson) summarized in his essay, but several limitations follow from what you provided:

1. Definitions: terms like “evangelical Catholics,” “traditional beliefs and practices,” and “good Catholic” can be operationalized in ways that bias interpretation.7
2. Self-report & category effects: asking “Is the Catholic Church the one true Church?” is “theologically misleading” while still “fascinating,” which indicates measurement problems even if correlations appear.7
3. Anecdotal supplementation: Portier explicitly uses “my experience, admittedly anecdotal” for some claims about where these minorities show up (youth ministers, theology majors, etc.).6
4. Temporal inference limits: he raises the need to test whether groups represent the past or the future, suggesting uncertainty about trend direction.7

C. The biggest interpretive risk: treating descriptive trends as causal explanations

Even when surveys correlate young Catholic identity with “traditional beliefs and practices,” that does not prove why people became that way. Portier partly addresses this by discussing social conditions (pluralism, loss of subculture buffering), but causality remains probabilistic rather than established.3 4 7

5) Pastoral implications consistent with Catholic teaching (as far as your sources allow)

Even without a full Magisterial conversion-policy text in your provided references, your sources support a few concrete principles:

A. Personal discernment and freedom matter when conversion is a “decisive step”

The Pontifical Council for Interreligious Dialogue states that changing one’s religion is “a decisive step” requiring sufficient time for reflection and preparation, via a process ensuring “full personal freedom.”12

So if “conversion trends” are discussed publicly, they should be framed around well-grounded discernment, not pressure.

B. Identity-building should include mentoring, community, and discipleship (RCIA approach)

Portier reports that one survey’s recommendation for building Catholic identity “in a positive way” uses the RCIA approach characterized by “mentoring, deliberation, community, and discipleship” as a model.6

That aligns naturally with Kereszty’s emphasis that conversion growth needs a visible ecclesial context and encounter with holy Christians/community life.9

Conclusion

From the sources you provided, the most defensible assessment is:

• Worldwide Catholic numbers can grow even while baptisms decline—so “conversion” trends can’t be inferred from membership growth alone.1 2
• Within Catholic life (especially among younger cohorts), there is credible evidence of an evangelical-Catholic confluence and a shift toward identity formation rather than merely “return/restoration.”5 6 4
• Causes appear to combine inner grace with external ecclesial/community encounters, and many narratives stress disappointment with a too-low horizon in other options.9 10
• Demographically, the discussion consistently centers on under-40 / post-Vatican II Catholics and a sizeable minority with stronger “traditional beliefs/practices,” though some claims are clearly not purely statistical and rely on reported survey summaries and anecdotal observations.3 6 7
• Data reliability is mixed: the global baptism statistics are solid as sacramental counts, but do not isolate converts; survey-based “identity” results require careful attention to definitions, self-report limits, and the difference between correlation and causation.1 7