The last but most powerful means of becoming an instrument for moral athiest peace is Martyrdom.
Worldwide recognition is essential to be poised as a symbol and a person. Then and only then does martyrdom propel all your efforts far into the future where your own toiling hands can not go.

MLK had a history with the church he could use suprerely well.

For an athiest to have such a path would probably require a Church of Moralism as well as other humanist organizations for support.

hmm the church of moralism could be the ultimate ecumenical church of all.