in  what  ways  did  the  early  christian  church  confront  the  problems  of
emergency  of   diversity  and the  theological  position  within  the  church.

Brilliant question onyesaw, and simply answered: The First Ecumenical
Council at Nicaea, commencing June 19 of the year 325 CE, commonly
known as the Council of Nicaea.

It is not the whole answer, since there had been many attempts at
dealing with emerging diversity within the early Christian church
prior to the council, and one could spend a great deal of time (a
career, in fact!) discussing them, but the biggest questions that had
arisen during the first three hundred or so years of Christianity were
resolved definitively at the council.

For more information, start with the Wikipedia page
at:http://en.wikipedia.org/wiki/First_Council_of_Nicaea

Alan Kali