Clarification on "necessary to salvation"
I should clarify a point that some people find confusing. When I say that the first-century apostolic community imparted to the church all that is necessary to salvation, I mean it as establishing a principle of non-contradiction. I do not mean it in an exclusionary sense that would rule out all traditional practices and theological schools of thought that have arisen since the first century. Of course, I do mean it to rule out new requirements unknown to the apostles. What I mean is that if you hold some belief that materially contradicts apostolic doctrine pertaining to salvation, that is something you hold in error. On that basis, any church that seeks to uphold the "faith once for all delivered to the saints" (Jude1:3-4) can be polite, at least, to any other that likewise holds these first principles as holy and from God and the baseline of orthodoxy. Churches with this basis for agreement among themselves will, perforce, consider one another Christian, and loveable as