Extra-Revelation

Many cultists, as we have said, have "extra-revelation", i.e. additional writings (akin to scripture) which they consider even more important than the Bible; remember the Book of Mormon etc. We must be able to demonstrate to the cultist why the Bible is THE ONE true source of knowledge over their "works", and prove why theirs must be regarded as false. Know the reasons why you believe what you believe, so that you can demonstrate the evidence for the truth of God's Word. Notice how Peter used the evidence in Acts Chapter 2. He used the historicity of Christianity and the prophetical truth of Christianity as his evidence, in order to teach and highlight the truth.

Having said all that, you may be thinking that you can't absorb all you need to know. Perhaps you think you haven't the intelligence, etc., but remember, the early Christians were just simple folk who DEVELOPED THE CAPACITY to know and preach the truth of God's Word.