Folks, allow me to note that the primary danger to the Church is hardly a matter of communion.
Try to see it from the Ministers' point of view.
I work with two youth groups and the building maintenance ministry. Every weekend, my guys get up on ladders and do for the Church what they do for my managers, Joe and Fausto Macias -- Catholics both -- at a Lutheran Church! Every other weekend, we help out at the Saint Michael's Catholic Church, and we're mostly Baptists and Lutherans!
The spirit of cooperation is helping us understand that there is ONE Church -- the whole body of believers in Christ. Anything past that is a minor doctrinal issue.
The primary danger the Church faces is from leftist liberals. These rebellious firebrands will do quite literally anything to subvert the Church and get people fighting.
Every week, I get applications from an average of eight convicted child rapists across my desk asking to volunteer with our youth groups! Four times last year and twice this year, felony DWI convicts have asked to drive our school bus, regardless that they cannot qualify for the required CDL. One still had a felony warrant out on him! That is a safety problem I will not tolerate!
The thing is, when I turn these people down, they become truly belligerent and they retaliate in ways I do not want to relate. I will say that these people know every dirty trick in the book and have written a few new chapters just to be annoying.
There is so much worse that you might not believe it, but it falls to people like me to deal with that madness.