I share Reformationist doctrine as far as TULIP goes, but not on ecclesiology, esp. in the area of discipline.
I DO find invocation of the saints & transubstantion 'offensive' but not personaly.
I'd agree we are the body of Christ in a figurative sense, but I would disagree that we are His blood in any sense.
At least I can't THINK of any scriptures that reveal that.
Anyway, I believe the hotbed & HQ of ecumenism to be The Lausanne Committee.
http://www.gospelcom.net/lcwe/index.html
or just Google "Lausanne Committe"
I see ecumenism as valuing unity over doctrinal truth.
I see some 'good' things result from 'practical ecumenism' like "wholesome" entertainment alternatives being offered, but even then, the differing standards(doctrines) will eventualy find fault lines between them.
I believe that with enough of the Holy Spirit in us, we will produce fruit like wholesome entertainment, anyway. The unity ecuminists seem to be seeking is a concrete facade that will provide tangible evidence for them that the body is inDEEd, unified.
I don't need tangible evidence.
So I idon't need a rigid hierarchy with an infallible leader, tiaras, or pinky rings(lol).
(Please don't regard this as personal insult, or if you must, please forgive me, & if you can't, please feel free to respond in kind because I certainly won't take it personaly or regard it too seriously, and I love sarcasm even when it's aimed at me, if it's executed w/any style that is. Plus I welcome rebuke that I at LEast ocCAIsionally deserve, & I appreciate everyone's patience with me in that regard- thanks.)
So I see ecumenism like Isreal saw having a king.
It's wanting everyone to feel good about each other in spite of fundamental differences, as if a 'group hug' will make them go away. Isreal thought having a king, a visible(concrete) sign(facade), would secure them as a nation.
As far as offensive doctrines & behaviors go, I figger ev'ybody gives up the right to take things too personaly as soon as they enter a public forum.
I believe it's the Bouncer's floor, and I just accept it as the price of freedom. If it was MY floor, I would rule it like a "benevolent dictator" I would hope.