How do you reconcile the passage that the church is "the pillar and foundation of truth" with the fact that non-Catholic churches teach conflicting doctrines, especially doctrines regarding salvation?
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Re: the papacy
Matthew 16:18-20 And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.
Isaiah 20:22 And the key of the house of David will I lay upon his shoulder; so he shall open, and none shall shut; and he shall shut, and none shall open.
Revelation 3:6-8 And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;
All the Calvinistic "non-Catholic" churches teach the same regarding salvation. No conflict among those of us who hold to the "doctrines of grace".
BTW There is no Isa.20:22