1st "study" did not mention whether or not those in prison "found" religion once in, or claimed to have that belief while committing the crime... Many stories about people turning to religion once locked up.
A quote from the author of the second "study" you posted,
I don’t mean to use the numbers to say that being religious MAKES you commit crime… but i think it’s fair to conclude that being religious DOESN’T PREVENT YOU FROM BECOMING A CRIMINAL!
I agree with this quote, because being religious does not stop you from being human.
Your third "study" is extremely biased, and that is pointed out in the first comment at the bottom of the article, in much better words than I could come up with.
Actually, Using these types of statistics (From the first and second "studies") does not really show very well. I could just as easily pick and choose prison stats for various large cities to prove that minorities commit the majority of violent crimes in the nation. When you use statistics for such a large area, especially for making a point against anything, be it religion, or minority, or whatever, and the majority of the people in that area are a certain way. It is easily understandable that the majority of the prisoners in that area will reflect the population. So please, try again. Because you are not changing my mind on the situation...
Also, if you are wondering why I keep saying "studies" instead of studies, it is because the articles that you have posted are not actually studies, but full of opinion by the authors... And, the first one is actually a wikipedia type article, which would be laughed at by any college professor that I have ever had.