There is no such thing as an "organization" which meets your requirements. Some gatherings have a few, others have many, many have none. The true body of Christ is being assembled by the Holy Spirit and is comprised of all of those who have been (and are being) rescued from themselves because they were laid hold of before the foundation of the world. Paul could not always tell who these were, and Peter at times acted like he was not one (Gal. 2), but Jesus knows His own. Do you need more?
+1
Yes, I need more than that. The Jewish apostles, at the command of, and with the express authority of, the Holy One of Israel, shepherded real local churches/assemblies that shared the same doctrine and had unity of fellowship. Your answer is that the true church is not really anywhere one could identify, nor are you willing to publicly claim your local church is the true church. Catholics, by definition, publicly maintain a claim of apostolic succession. Who else, besides the Eastern Orthodox, does that ?