As an evangelic and Calvinist I have little use for the ecumenical movement. Phase one seemed to be to merge our doctrines and return to a pre reformation position and even include those that deny the nicene creed like univeralists and unitarians , phase 2 , now in effect in our area includes those that deny Christ in the mix like Hindus and Muslims with whom we absolutely no fellowship .
I have no issue with sharing actions on major social issues with others that affirm Christ. But you will find few Calvinists or evangelicals that will return to Catholic doctrines or share "worship" with those that have other gods .
Sigh... You Calvinists are nothing if not strident.