Hi JD,
Just came across this...
I don't know if
@Marymog has replied, but I will.
It would be interesting to know what you mean by a false tenet before answering, but I'll take my chances.
The CC believes that it holds the entire truth because of Apostolic Succession. If we want to be intellectually honest, we have to accept that if we go backwards in time, we come to the Early Church theologians (or Fathers) and they were taught by the Apostles, or someone the Apostles knew. Since this has been passed down, the CC believes it is the pillar of truth.
Some doctrine did evolve in time, but the church is very much trusted by Catholics.
They are required to accept dogma and encouraged to accept doctrine. If they don't accept dogma, then they pray about it -- for understanding, I mean.
This has kept the CC together for 2,000 years...something I cannot say about the Protestant church with all its denominations, to say nothing of independent churches with their own doctrine.
If a church believes it has the ENTIRE truth, then by default it believes others don't. However, I do know for sure that it teaches respect of all religions and persons. If this is not shown by any individual, he is going against church teaching.
I hope this answers your question...