Except for the fact that Jesus established only one Church and the rest are just sects established by men and teach doctrines differing one from the other.
Except that the church Jesus established is a spiritual house of which all genuine believers in Christ are being built up into it as LIVING stones (I Peter 2:5) and not a single, physical organization that only claims it is the one, true church. The word "catholic", at one time, meant the universal faith believed by the body of Christ and was an ADJECTIVE describing that faith - as taught by Jesus and which the holy men of God, who were carried along by the Holy Spirit, wrote down God's revealed truths which are found in sacred Scripture. We have "the prophetic word made more sure", to which we do well to pay attention as to a lamp shining in a dark place, until the day dawns and the morning star arises in our hearts. (II Peter 1:19).