Canonical texts create religious communities. This is why, for example, the ending of Mark has become a canonical crisis: those who reject the traditional ending have formed another canonical text and another religious community.
Those Christians today who hold to the traditional canonical text of the Reformation constitute a 500 year-old religious community.
Those Christians today who hold to the modern versions, which are based upon the modern critical text, constitute a new religious community with a new (critical) canonical text.
These two religious communities are not the same, due to their differing canonical texts, despite their similarities and agreements in other matters.
“A biblical canon or canon of scripture is a set of texts (or ‘books’) which a particular religious community regards as authoritative scripture.” (Wikipedia)
“In short, the status of canonicity is not an objectively demonstrable claim, but is a statement of Christian belief.” (Bruce Metzger, Canon of the New Testament, p. 284)
“The status of the sacred text is canonical: as well as being normative for a community or tradition, it is also that community or tradition’s canon or canonical text. The term ‘canon’ has a variety of meanings, but in the context of sacred texts it means the defined groups of texts for the community or tradition . . one does not add to or subtract from them.” (Ninian Smart and Richard D. Hecht, edd. Sacred Texts of the World: A Universal Anthology (New York: Crossroad, 1982), p. xiii-xiv.)