Unanswered Questions I Have About Demons 1985

Before anyone freaks out, let me boldly say that I LOVE this movie... I didn't see it until I was about 11 or 12 years old but when I did, it stuck with me in all the best ways. There's blood, there's gore, there's actions, there's score (bars), a katana, a dirt bike, and demons nonetheless. But with all that being said, there's also a SHIT ton of plot holes here that I've let slide long enough. There's just a plethora of things here that make no sense whatsoever and while the film overall is great, the questions I have stick out like crazy. I just need to know a few things. 13 of them to be exact. Enjoy, people.