Ok... here is the thing: I think gargoyle were made by man as the thing says, and were made to counter demons. Angels are might be considered like *good* side, but I am gonna say this right now: It does not mean that if you come from Heaven you are good. So angels might be considered good, but...
There not really a side to decide here.
Also in your app, just a little thing: Making the weakness of being far from a church kinda makes me unsure. The reason would be that it would make you stuck in the city most of the time and such, and I don't see a real link that could be done with the church thing, cause they do come from the Demonic world, sent by man we could say, so making it that he would be weak if far from a church makes me unsure about the app. Maybe replace by another kind of weakness?