And the Romans make the same claim, despite distinctive Catholic teachings not being manifest in the only wholly inspired substantive authoritative record of what the NT church believed (which is Scripture, in particular Acts through Revelation, which best shows how the NT church understood the gospels). And cults also assert themselves to be the One true Church. However, the one true church which the Lord promised to overcome the gates of Hell was and is the body of Christ that the Spirit baptizes every believer into, (1Co. 12:13) and to which He is married, (Eph. 5:25) for it uniquely only and always consists 100% of true believers, while organic fellowships in which they express their faith inevitably become admixtures of wheat and tares, with Catholicism and liberal Protestantism being mostly the latter.
The Church of JESUS CHRIST of Latterday Saints is the original and true Church!