1) These advocates of false doctrine change the subject to the meaning of "grace" then deny that was a change of subject.No one's changing the subject.
Buried somewhere in this monster is the subject of the accuracy of the message vs the effectual response of faith.
So tell me...is it the flawless accuracy of the message that counts, or the object of one's faith? What was it in your case?
2) The fact is that born anew believers are to be intolerant of false doctrine. See the OP.
3) No one said or suggested the gospel message must be perfect in order for the lost to place their faith and devotion in Christ. So another deflection hoisted to hide the fact God uses our faith and devotion to determine whose faith He will credit as righteousness. That fundamental truth of the Gospel is denied by the alternate and false view from the dark ages.