As a former Witnesses, I have spoken to tons and tons of Christians since my exit. Some want to convert me to their faith, heal me of what they see as false information in my youth and so on. When ever I speak to them, not being a Christian now, I have certain things that guide me. Items that I must see in them or I will drop my conversation with them like a hot potato.
1. They have to admit and accept their are two gods spoken of in the Bible, the one in the old testament and the one in the new testament. Admitting one was very angry and the other was very loving.
2. They have to admit that religion has been responsible for more deaths in history than it admits too, and not ignore this.
3. They have to admit there is no evidence of heaven or hell.
4. They have to admit that prayer can not only be credited for what they saw as an answer, and not ignore the ones they did not get answered.
5. They have to admit that several religions in this world, older than the Christians, have the same thinking and thoughts as Christians without the Christ thought.
6. They have to also be willing to listen, as well as talk.
7. They can quote no scripture, as to quote something I have no faith in is silly and their thoughts mean more then those of someone they never met and highly subject to interpretation.
If they can do these rules, I talk.... otherwise I walk. Do you have a code like this?