All those who claim to be Christians do (inluding Mormons and JWs). Where does it say in the Bible that reading the Bible will lead you to the truth? And how many "versions" of the truth are there?
Your message calling for unity is welcome; it would be wonderful if we could all agree. But what's the alternative? To say that there is a little bit of truth in any man's religion and call it even? No thanks. God is not relative. We can't say that the Jews are partially right, or that the Muslims, who read the OT as well, are also aprtially right. Nor can we gve the Hindus the credit for knowing one God, as they claim.
Christ gave us a Church. Yet there are thousands of denominations, each teaching something different. That's not united Kingdom, dear friend. That is a House divided, a house made in man's image and to man's taste. There is only one Church, and one catholic and orthodox faith.
Christ did not declare Peter infallible - a man declared himself infallible. The claims by the Catholic church of being the only true Christian church organization are not supported by history or the Bible.
Again - focus on the house in which you worship instead of focusing on the Truth as given by The Truth is a sure path to division and destruction.