Ok, so the Greek philosophers corrupted John's thought too? Does that mean his Gospel is not inspired? Also, you really believe that Christ's Church was in error for 1800 years until Joe Smith found the plates? Despite Jesus's promise that the Gates of Hell shall not prevail?
That's a trick question, as we believe Christ's church was gone with the death of the last apostle.
Despite Jesus's promise that the Gates of Hell shall not prevail?
We believe the restoration of Christ's church is a fulfillment of that promise.