NEVER.NEVER,NEVER try to dispute their (WT) ideas or their beliefs of the bible.You will get nowhere.Total waste of time.INSTEAD.
Ask questions such as:What happens after I get baptised and I disagree with the Faithful Slave/GB?What happens when one mate is not in the truth,Can they take their children to their church every Sunday?Can they take their children to Xmas parties or participate in sports?What about employment can I work on a Catholic church?What if my un-JW mate wants me to go to church.Can I give blood since JW say it is ok to take /steal someone elses blood fraction?
Questions them on things that will drive them crazy.
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