About the PHINEAS GAGE case indicate that the character of a person not dependent on (or no) CHRISTIAN:?

Christians like to say that people sin because the Devil tempts. But I saw about one case of a man [P. Gage] who worked in the construction of railroad and, because of an accident - a beam of iron ped through his brain - his personality changed for the worse, before that, he was considered good. From this case would to conclude that the goodness or badness of someone depends on natural factors, rather than being caused by the influence of God or the Devil? P. Gage, in this case, would be subject to condemnation to Hell, or he would be acquitted - as he has no control over the reactions that his brain has?