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I don't know what the irreducible minimum of true belief is that is necessary for salvation. Also I don't know how much error and of what type one can hold at the same time.
But this is not the only issue about heresy. If heresies are not opposed, and the teaching of them in the churches prohibited, the will grow. Around them practices will grow up that train people to put their faith in the wrong things, as has happened historically with the sacrifice of the mass, penances that are ordeals that expiate sin, indulgences, etc. These practices training the belief of subsequent generations.
Some of the debate today is over what must be believed for saving faith to exist. There are those that claim, for example, that we can be justified by faith alone, by believing that Jesus saves us some how or other, and without that believing including the doctrine of justification by faith alone as part it its content. But when the church begins to teach that we are not justified by faith alone, then the people will resort to something other than faith. They will resort to works, submission to institutions, rituals, etc., placing their trust in something other than Jesus. Then the faith in Jesus, however, minimal it must be to be saving, is altogether gone.
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