The biggest is being called Calvinism when it should be called Reformed Theology. You know why? Because those that disagree say we are basing a system of theology on a dead person whom lived in the 16th century when in reality we are relying on the Bible. A book I am reading is explaining the history and defending the five points with scripture. Arminian have a great issue with us because of this and they are correct. I do not like being called Calvinist, I like being called Reformed. Another flaw is the combative non graceful manner that some speak and treat those that disagree. I had a chat with a strong Calvinist a few months back and he was very condemning towards my wife and even hinted that she was a false convert. She is not Reformed but she loves the Lord. This man did not even know my wife nor her testimony. Also once I went to see a popular preacher in Atlanta, GA and some hard calvinists were out open air preaching and passing out flyers condemning a whole bunch of non Reformed leaders some of which were. David Jeremiah Charles Stanley Erwin Lutzer Greg Laurie Charles Swindoll Chip Ingram Charles Colson Woodrow Crow Randy Alcorn Yes they had billboards and passed out flyers condemning these men!!! Well they did not mention Luzter, but when I asked them about him they had some bad things to say about him as well, because he does not teach Lordship salvation and uses the sinners prayer. Fellow Reformed we need to get it together! Arminian do have a point.