We are ALL prey to Satan and false doctrine. Doesn't Peter say that in his epistle? That includes you, as well as me. The difference between us is that I know where I can receive the truth - from the pillar and foundation... You believe YOU are the source of truth. I look elsewhere.
BTW, have you ever wondered if some of those "heretics" were actually right and our MARTYRS that we will meet in heaven?
If the Church officially declared a particular teaching a heresy, then I don't wonder if they were right. They weren't. However, perhaps their death served as a temporal punishment for the sin of their false teachings and they are in heaven (presuming they were mentally asking for forgiveness from God). I don't know who will be in heaven except for those the Church has cannonized.
Regards
"You believe YOU are the source of truth. I look elsewhere."
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Typical cheap shot when you really don't have a leg to stand on. You can look to your institution to tell you what to believe and think. I will search the SCRIPTURES meditate on them and pray for the HOLY SPIRIT to open my eyes.