I have not met a single Christian in prison who followed the Bible when they got arrested.Mainly because if your following the Bible then their should be no reason to arrest you!
Of course, except owning slaves, killing kids who misbehave, stoning people for working on the sabbath, etc... that sort of nice stuff that's in the bible, right? :)
1 thing though... it's not surprising for a non believer to see there existing a lower percentage of atheists in prisons, or a lower percentage of atheists who are very uneducated compared to the population of believers.
On the other hand, it should be a heavy burden to carry if you are a believer, to justify why indeed there aren't a lot more atheists who are uneducated and commiting crimes if it's true that there is an advantage of being religious, when in fact it seems the situation seems to point exactly the other way.