It's not always true that a strict religious/legalistic upbringing will produce rebellion and angst, but in many cases it really does light the fire. Although I don't have the inside scoop on James Hetfield of Metallica, it seems that that may have been the case in his life. Metallica lyrics have often contained a lot of seemingly anti-religion themes. The Wikipedia article on Hetfield mentions his strict Christian Science parents. Here's one song that reveals what I think a lot of the children of strict religious parents go through.
(Video warning: language at one point)