Yeah I think people are way over reacting...I think Calvin originally took what Peace said out of context (as if someone here was making an accusation). For example, I have heard some JWs say this very thing about trinitarians and vice'versa, back when I was an immature strict Calvinist I used to say such things about Roman Catholics in general (that they were deceived and possibly the tool of Anti-Christ and so on)...I am ashamed to admit it but it is the truth (and the truth sets us free) I was or had become over zealous for theology and even judgmental (may the Lord forgive me)....
As young new babes in Christ, some of us see our theologies as "the truth" (it becomes like imposing the letter of the law)...the truth is, God's grace in Christ is greater than all our theological differences all rolled into one box and we (as brothers and sisters) can agree to disagree discussing our perspectives (which helps us all grow) and need to be a bit more patient. I know some who are uneducated (I think of one Holocaust survivor named Zophia) who know practically nothing of the things we always discuss but man, I tell you, she loves Jesus and knows that without Him she would be toast...she loves prayer and reading her Bible...but Catholic, protestant, Reformed, Pentecostal, Orthodox, etc.? These things mean nothing to her....she just loves and worships and thanks...
Do you love God with thanks for His grace in Christ and know that He died for our sins and that the Father raised Him from the dead? Thou doest well...
so a lot of the time these accusations are a result of theological clashes (and face it we each only know in part until we are 'face to face')
In His love
brother Paul