As mentioned earlier, trying to bring some friends can be a massive help in defeating the demon. If you don't have anyone to call upon, then do your best to cheese the demon. Avoiding his attacks and playing a more hit-and-run strategy with a bow and arrow or daggers can make this fight much easier, allowing you to avoid the danger of head-on combat. The Albino Bat Demon is one of the easier fights in the game though, so it's worth it to bite the bullet and learn how to fight him the traditional way if you're a new player.