There is a sharp divide between Orthodox (eastern) and Catholic (western) churches.

I've been reading a book The Councils of the Church: A Short History by Norman Tanner. It is interesting that each ecumenical council (link) was convened to deal with an issue of orthodoxy, and that after the decision was made a schism occurred. For example, the Fourth Council of Constantinople which led to the Roman Catholic/Orthodox schism and the Council of Trent which led to the Roman Catholic/Protestant divide.

Ceci n'est pas un seing.