We also have churches that still hold some services in German.  When they came to America, they often found that the Lutheran church with its top-down hierarchy would not allow them any German liturgy.  Thus the German Congregational Church was born when the Congregational Church's more inclusive congregational polity allowed them to continue their own ways of worship.  (The Congregational Church was one of the denominations that merged to become the UCC in the 1950s, some of which were German Reformed, that is Germans who were already Calvinists.)

I really don't see Trinity's African focus as being all that different.  It's a predominantly African-American church!  I actually rather honor their commitment to Africa.

a "faith."  It's more of a philosophical orientation, or at least that is how I've thought of it, a way of applying faith in a given social context.  

I mean, as far as the faith tenets - God, Jesus, the Holy Spirit, Baptism, the Sacraments - it's all pretty standard fare.