The trouble with Gods and Generals, us that they tried to reconstruct the speech patterns of folks in the 1860's. This made it boring beyond belief, something that would have been much better read over a couple of days than watched over four hours.
Stephen Lang, crippled by a ponderous script, nevertheless was able to convey a picture of Jackson which I imagine is correct: a brilliant religious lunatic with a warm heart.
What the movie did, or should have tried to do, was portray the "cloud cuckoo-land" mentality of ardent Confederates. For a better understanding of that, Experiment in Rebellion is an excellent work, describing the policies and personalities of the Confederate government in Richmond.
These people were mad as March hares.