Whew.
The Ligionier Ministries folks published a while back an exquisitely hard hitting yet painfully surgical dissection of that sadly mistaken mindset of the Christian who wants to cult bust at the expense of ministry to a cult member. It details the thoughts of a Christian minister who agonizedly came to recognize how well versed he was in the school of defending the faith in the manner of an assassin .. not an ambassador.
Ouch.
Click here for an article done so well, you won't know you need to feel for broken bones after reading it.