If you sit in judgment upon the Word of the King of kings and Lord of lords and divide it into what you deem important and non-important; essential and non-essential, then by definition, you allow for false teachers and false doctrine.
2Co 11:4 For if someone comes and proclaims another Jesus than the one we proclaimed, or if you receive a different spirit from the one you received, or if you accept a different gospel from the one you accepted, you put up with it readily enough.
1Co 5:6 Your boasting is not good. Do you not know that a little leaven leavens the whole lump?
1Co 5:7 Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed.