- He’s not a Christian
- She doesn’t know the Lord
- He’s probably in hell today
make sure you’ve worked your way through the normal method of drawing such conclusion.
Citation
You simply must quote the name of the work in question and page number. Include the quotation. If you can’t honestly bring yourself to purchase a copy of the author’s book, while I admire you for standing on your principles and not spending money on someone you don’t think you can support, know that you have forfeited the right to critique their writing. There is no need to read further.
Identify
Make clear what it is in the quotation that you feel is worthy of examination. Everyone else may be reading this and seeing “A” but if you feel “B” is present, note both the impact and implications of the authors words. State what you see the author saying. At this stage avoid citing third parties. This is about what you want to express concerning the author.
Verify (1)
Make sure you’re not ‘proof-texting’ the author. Don’t use pull-quotes to deliberately be provocative if the body of the larger paragraph doesn’t support your thesis. Is the author using sarcasm, humor, etc.? Jesus himself used hyperbole on several occasions in his teaching. (People who feel they have been called to defend the faith against heresy are, for reasons that escape me, generally lacking a sense of humor.) I know one particular author who is not known as a humorist, but did one title totally tongue-in-cheek. And certain people will always miss that sort of thing.
Verify (2)
Do the research for yourself. Don’t quote someone else. And make sure that person has followed these steps. (The propagation of the KJV-Only movement happened only because people built a foundation on ‘so-and-so says.’ In fact the whole thing can be traced back to two individuals, with very little primary research done by others.)
Compare
Now that you’ve followed those steps, compare what the author says verse-by-verse with scripture and make the case that there is definitely a conflict.
Avoid Generalization
Just because an author can be faulted on an individual point does not mean that their ministry has a whole deserves to be labelled heretical. (I would be greatly hurt if you called me a heretic just because I have views on eschatology that are different from yours. Which, by the way, I do.) For more on this, Google the phrase ‘logical fallacies.’
Civility
Avoid name calling at all costs. Even if the person is a ___________________, it diminishes your argument. I would go so far to say it completely undermines your argument.
Repent
If the tide of public opinion on a particular author is positive and your view is negative, ask yourself why you are the lone prophet in the wilderness. Look for the fruit. If there’s fruit, and it’s good fruit, God is using them. “Who are you to judge someone else’s servant? To their own master, servants stand or fall. And they will stand, for the Lord is able to make them stand.” – Romans 14:4
Humility
I would want to avoid the actual charge, “Heresy!” Sufficient to say you have concerns. And don’t even begin to express opinions about the eternal destiny of someone based on what you’ve written. Even if every charge you make about doctrinal aberration is correct, you don’t know that.