Sad, yes, very sad -- but not nearly as sad as having a putative "Minister of the Gospel" dismissing the practice as a big "so what?"
I'm familiar with the New Testament, thanks. It's sad that in a prison environment weak Christians will do whatever it takes to survive at the time; unfortunately it's all too common.
I read the article at the link. I see nothing where Warren dismissed the islamic conversion as a big "so what", he merely stated that it was a conversion of necessity in prison.
The article looks chopped up, like the author just pulled snippets out of the conversation. It's hard to tell what Warren actually thought about it without seeing the statements on either side of the quote.
Do you have other articles?