I thought you were a student of history, Diego. If so, you would know that virtually nothing in the church has "lasted" or stayed the same for 2,000 years. Those 2,000 years of church history have included endorsements of morganatic marriage, arranged marriages for minor children, political marriages, and other things which we would not endorse. Those 2,000 years of church history have seen changes in the practice of ordination, church structure, lines of accountability and authority, relationships to civil entities, liturgies, church architecture, approved or disapproved aids to piety (remember the iconoclastic controversy?), and oh, maybe five or six other things that people like to say were set by "2,000 years of church history."
Whatever case you want to make for something, except perhaps for the simple confession of faith, "Jesus is Lord" (and it took us a couple of hundred years to sort that out), you can't make it based on "2,000 years of church history."