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It requires a strong constitution and significant oratory skills. A thorough understanding of psychology will be beneficial.

Start small. Godspeed brother.

I haven't attempted what you propose, but if you are looking for a single graphic to illustrate "a picture is worth a thousand words," then I think the 1933 & 1948 religious population statistics can make quite an impact: https://web.archive.org/web/20180919120637/http:/www.thetruthseeker.co.uk/?p=85432 Of note here, be sure to take a look at the decline in European Christians in that fifteen-year period of time!

You should be able to get some other good ideas from this page: http://radiochristianity.com/holocaust-deprogramming-course/