CWR: How Many Faces of Christ? by Dr. Leroy Huizenga
Philip Jenkins' "The Many Faces of Christ" displays plenty of scholarship and erudition, but suffers from a blurring of textual and theological lines that reveals a problematic reliance on sociology.

The Church in Japan

From 2014:
Bishops set out difficulties facing Japanese Catholics
Catholicism Fails to Take Root in Japan
Philip Jenkins: DESTROYING JAPANESE CHRISTIANITY

From 2000: Translation Wars Loom in Japan: New Japanese Missal sparks controversy

The Early Church

Post by Orthodox Christian Network.

Other "Christianities"

Turfan and the Christians of the Silk Route by Philip Jenkins (Patheos)

The impact of demographic changes upon Christianity

The Rise Of Anti-Western Christianity by Matthew Roberts (via Mere Comments)

The tension between inculturation and upholding orthodoxy and orthopraxis: what can be a counter for the rise of "charismatic" Christianity and a form of piety that is dominated by emotions? Have the Latin Christians lost the opportunity to be effective? Is it time for the other apostolic Churches to take over, having a more tradition liturgy and a better sense of liturgical piety? The Eastern Churches may be different from the Latin Churches, but I think they share more in common with the traditional Latin Catholicism in their understanding of theology, liturgy, and spirituality than with the charismatics (and modern Protestants).