Will jesus burn mel gibson in hell for his divorce?

no. You don't sin by divorcing your wife, you sin when you divorce your wife and then sleep with another woman. Because even if the government see you as divorced under god you are still attached to that woman and if you marry another woman its as if you were cheating on your ex wife. Bible says man(government or anyone) cannot separate what god has united. Even if you are legally divorced to god you are still married.