Here are Tim Keller, Michael Horton and Matt Chandler telling us how it’s done. One piece of advice is particularly helpful. They highlight the importance of limiting criticism to positions actually held by your opponent. Don’t confuse your opponent’s view with what you see to be the necessary entailments of his view. For example, you may think that consistent Arminianism leads to open theism, but it is uncharitable and unfair to describe all Arminians as open theists.
(HT: Justin Taylor)