Talking to religious persons who believe that to be right
with God one must be approved by their organization.

Through personal contact I have found these religious groups have doctrines that contradict each other, usually some organizational doctrine contradicts a religious doctrine. In order for me to become a member in their organization, they required me to affirm one doctrine but deny another fundamental teaching. The "True Church" would not insist on that. I do not claim that these groups are evil because of this position, I only point out that they cannot be the "True Church". If believing a church's doctrines leads to being expelled, then it cannot be the "True Church".
My critics ask me why am I writing this. I should answer that first. . . . Because I want to do for others what I would want someone to do for me if I were in their place. 'Do unto others as you would have them do unto you.'

How should we talk to such persons? The Bible gives guidelines showing how to present the real truth of the Bible. We should be gracious and respectful (Colossians 4:5,6; 1 Peter 3:15), not fighting (2 Timothy 2:14,24,25). This becomes especially important when dealing with non-mainstream religious groups who are resistant to discussing any view different from their own. The method I describe here for witnessing to such groups is gentle and does not generate a battleground between the presenter and the other person.

The principle underlying this presentation method is Jesus' statement "No one can serve two masters, for either he will hate the one and love the other . . ." (found at Luke 16:13; Matthew 6:24). While this was said in reference to the love of money it applies to human masters as well. A person may imagine he can serve two masters but Jesus explained eventually one will be forced to choose between the two and thus, in effect, love one and hate the other. Religious members who put all their trust in their religious leaders to lead them to God end-up serving two masters. Through the approach detailed below, you can show them their religious doctrines collide with their organizational doctrines, forcing them to choose between their God and their religious leaders.

I start by asking them to explain two specific doctrines, doctrines that I have chosen very carefully and ones they also desire to discuss. These two doctrines are self-contradicting. I am careful to take the attitude of a newspaper interviewer and have them detail the implications of believing those doctrines.Then I ask them which one I should believe. To believe one of the doctrines with its natural consequences prevents one from believing in the other. They cannot believe both doctrines at the same time, they can accept one but must reject the other.

At the end of the discussion, I ask this final question:
"At first you said that one must believe <issue One> and to be a member in your religion I must hold to that. But regarding <issue Two> you said that I must do (or believe) differently. So my question is this, if I were to believe <issue One> as you taught me, with all of the natural implications, would I be welcome in your religion?

Every (informed) member of that church has answered me in effect. . . "No, if you were to believe the doctrines that we first taught you, along with the natural implications, we could not welcome you as a member in our religion and if you were already a member, we would expel you."

Why talk to them this way instead of immediately challenging them with Bible scriptures that challenge their views?  Because it is easier for a person to examine his own beliefs than yours and it is easier to lead a person to affirm doctrines he is supposed to believe than it is to persuade him of doctrines he has been taught to refute. 

For the Jehovah's Winesses I no longer have a text document but have a YouTube channel instead. Watch the videos in order to see how to witness to the Jehovah's Witnesses

For the Mormons - The Church of Jesus Christ of Latter Day Saints (LDS) - I ask this:
    1) "If I were to accept your teaching that the Book of Mormon is the most correct book on the planet and was translated into English by a prophet of God for us to understand and if I were to accept the words in that book at 3 Nephi 11:21-28 as being true and authoritative and if I were to be baptized exactly as stated there according to those words - supposedly spoken by Jesus - then would I be welcome in the LDS church?" . . . Their answer is 'NO'.
    2) "If I view the the sacrament (Lord's supper) as holy and wished to have a clean conscience while taking it and wanted to eat it the way Jesus, Paul (and Joseph Smith?) did with unleavened bread -- eating leavened bread for the Lord's supper makes me feel unclean since it represented sin (1 Corinthians 5:7,8) -- would I be welcome in the church?" . . . Their answer is 'NO'.