It comes as no surprise to me that some unprincipled atheists would use the examples of Oral Roberts, Richard Roberts, Richard's high-fashion, high-living wife or other members of their tribe of false prophets in an effort to castigate Christianity in general.
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Who uses the roberts? This may be the first time they were mentioned. If the roberts were the only ones doing these things you might have a point. Like RP posted, rob people with a gun and you go to jail, rob them with the "word" and you get rich.