I have thought that as well. But a few things bother me. Breaking and entering, by smashing a window, isn't really a prank. There's usually an intent to steal, or violate the church, and yet the footage shows no apparent purpose in being there. It also bothers me that they broke in at 3:50 am. Pranksters are more likely 11pm-2am operators, IMO. 3:50 implies going to bed early to get some rest, and setting an alarm clock, and then dragging yourself out of bed to go out. That's why I wondered if the person was high. But it's unusual for someone so apparently relaxed while on drugs, to turn so violent, leave no clues, and successfully get away. That all seems like someone with their wits about them.
Then, of all the churches you could break into, you choose the one, in the middle of nowhere, where someone else shows up just a half hour later! And you happen to be close enough to physically encounter that person when they arrive, and not be in another part of the church, or slip away when you see/hear them. And you turn out to be, not just a prankster, but capable of murder: it's easy to hurt someone, but IMO killing them takes real effort, and sticking around for a bit, rather than running away. I'm just finding all these things hard to reconcile with coincidence.
I do agree, there was no need to enter the church at all if the goal was murder. If she'd just been shot and left in the rainy darkness, the crime certainly wouldn't have gotten all this attention.
ETA: it makes me wonder whether the killer was enacting some kind of fantasy.