@Nathan,
Name any religion that advertises that they are NOT the true religion.
I have attended dozens of churches over the past 20 years and never even remotely heard that any of them thought they are the one true religion.
Only cults claim this.
However I would like to take this opportunity to announce that I personally have founded the one true counter-cult ministry.
@Fisherman
JW teach that the wt is part of the Messianic kingdom
They claim more than that. They teach that they are the visible part of the kingdom of God on earth, same at the Roman Catholic Church:
Catholic Catechism # 882 The Pope, Bishop of
Rome and Peter's successor, "is the perpetual and
visible source and foundation of the unity both of the bishops and of the whole company of the faithful.
For the Roman Pontiff, by reason of his office as
Vicar of Christ, and as pastor of the entire Church
has full, supreme, and universal power over the
whole Church, a power which he can always
exercise unhindered."