1-Don’t explain Christianity by experiential reasoning but by demonstrative explanation only. This isn’t the time for “goose-bump” moments. Be direct and exact making it perfectly clear that Jesus is God by showing them how and why the scripture has been fulfilled, how they can be saved, etc.
2-Remember they’ve given up their spirit, albeit unknowingly at times, to Ba’al.
3-Having the last word will kill your witness. Walk away.
4-Body language is of utmost importance. For example; don’t fold your arms around a Mormon, especially while praying.
5-When they give their testimony, interrupt them. Make a noise by dropping a book, etc., to bring them out of their trance. Pay attention to their eyes because they will usually dilate during ‘bearing of their testimony’. Bearing their testimony is a way of self-hypnosis. While they don’t realize they have hypnotized themselves it does happen and the reason why is because it is done by rote.
They’ve been taught what words they should and shouldn’t use during “testimony bearing” as well as during their prayer time. They are taught it must not be too lengthy or wordy, but to make sure they always include they know Joseph Smith is a true prophet of God and the LDS Church is the only true church. They will close their testimony by saying “I bear you my testimony in the name of Jesus Christ, amen”.
6-Ask them what the most significant thing is to them personally about the organization. This causes them to think.
7-When they use scripture to defend themselves, ask them to qualify it for you. i.e.; location of verse, is it in context, etc., ninety-nine percent of the time you’ll have to show them where it is in their own Bible. Know the order of the books in the Bible. Ask them how they knew they could trust the verses they used from the Bible.
8-Remember that as a Christian you’re dealing in the spiritual realm, not with the actual person in the cult.
9-When they ask you where you got your authority from; tell them you got it from the same place John the Baptist got his.
10-While praying never allow the Mormon to do the praying. Remember they’re not worshipping the God of the Bible. You take the authority and introduce them to the idea of holding hands while praying. It is unsettling to the Mormon, but show them with love how it is done. Remember that body language speaks louder than words at times.
11-If at all possible use a KJV Bible when witnessing to the Mormon. While their reasoning for KJV only seems ambiguous since they don’t believe it’s been translated correctly, we want to remember what Paul taught in 1 Cor. 6:12; “All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.”
12-Please do this in love.