Direct answer: About 2.3 to 2.4 billion people identify as Christians worldwide, corresponding to roughly one third of the global population, based on recent global religious demographic estimates. Context and nuances:

• Global estimates vary slightly by source and year, but the consensus places Christianity as the largest world religion with approximately 2.3–2.4 billion adherents. This aligns with major demographic compilations that track religious identification across countries and over time.

• The distribution is shifting toward the Global South, with a growing share of Christians living in Africa, Asia, and Latin America, while numbers in traditional Western countries remain substantial though the relative share of adherents has declined slightly due to demographic trends.

• Denominational differences (Catholic, Protestant, Orthodox, etc.) account for a large portion of the variation in counts, but all major groupings are encompassed within the broader Christian category.

Notes on interpretation:

• “Practicing” Christianity can mean different things (identifying with the faith vs. regular worship or active participation). The commonly cited figures refer to people who identify as Christian, which can over- or under-represent active religious practice depending on the region and methodology. If you want a breakdown by activity level or by denomination, I can pull more granular estimates.

Would you like a concise table of current estimates from a few reputable sources, or a regional breakdown (e.g., by continent) to illustrate the distribution?