DMcFadden
Puritanboard Commissioner
If I may comment, perhaps the consensus ecumenical creeds are better used for determining the bounds of "damnable heresy" than the boundaries of fellowship? RC and EO adhere to the councils also, but certainly cannot have fellowship (at least not within the same visible body) with those who hold to the Five Solas. Whether veneration of Mary, sacramental grace, etc. constitute damnable heresy still isn't resolved, of course...
Interesting point. Ultimately, however, I would argue that my word "fellowship" should be interpreted as acknowledgment that the other person is a fellow believer, even if we confess that he/she is one in error. Back to David's issue, do you really want to consign a credo baptist to hell for the "error" of our convictions regarding baptism? If not, can you say that it is "damnable" heresy?
I will "fellowship" with (NOT join the same church as) any Christian who holds to historical Christian orthodoxy. This does NOT require a particular eschatological schema, determination regarding Israel and the Church, or conclusion regarding the objects and mode of baptism. People on both sides of those divides can be, are often, and have proven to be orthodox Christians.
When it comes to my "confession of faith," it ought to reflect as accurately as possible the consensus of the people in my particular tribe and what we can agree to accept as true. Necessarily a credo baptist will consider a paedo baptist to be in "error" and vice versa; a dispensationalist will excoriate the hermeneutics of a covenant thinker; an amillennialist will be shocked by the "mishandling" of scripture by those preterist postmils and historic premils. However, since all of these people hold to orthodox Christian beliefs, their errors are not damnable, regardless of how greatly we might want to consider them serious.
BTW, in my observations, the doctrines of Christ and the Bible are good litmus tests. I have never met an orthodox Christian who denied either of them.