hum? It is Christ that is the eternal.
Churches/denominations may disagree around the edges, it is the eternal Christ that is the only Truth, it is the Body of Christ that is the church.
As St. Joan of Arc said at her trial: “The Church is Christ, and Christ is the Church.”
Any church that does not claim to be Christ, and to teach everything that Christ wants taught, is just a human club.
The only Church I want to belong to is the Church Jesus was talking about when He said, “I am the Vine, and you are the branches.”