Ah yes, I am currently playing this game. It is by the guys from From Software, responsible for the Dark Souls and Armored Core series.
I love this game and I think it is the best RPG they have made to date. It is essentially in a unique Victorian Gothic Horror setting (think the original Dracula novel mixed with Lovecraft). Really beautiful, although I admit I am kind of biased because I love horror, macabre, and goth type stuff (always have). Of course, like its predecessors Demon's Souls, Dark Souls, and Dark Souls 2, it has incredibly challenging (and punishing) gameplay with a lot of reward and a surprisingly deep plot. The plot isn't immediately obvious and takes a lot of digging and speculation which is a big part of the online community surrounding this game. That and the sort of old school type of difficulty level (think of the hardest NES game you ever played) is part of the shared experience within the community as well.
If you are wondering whether or not it is a family friendly game? Well, no, not at all. There is more realistic combat, more so that most RPGs. I like it cause it is a very deep combat system, but it is more violent and bloody than their previous games that follow the same vein. The previous RPG games could have any blood that may have been present turned off while Bloodborne doesn't, and well, there is a lot of blood. Blood is a crucial part of the game mechanic and story so it isn't just bloody violence for its own sake but is still definitely R rated.
As far as spirituality goes, take it for what it is, that's my advice. It's a completely different universe and a very different world as a basis. I haven't quite figured out the entire plot and world setting yet though so perhaps I can post more later. Let me beat the game once or twice (since each of these games offers a New Game+ feature which ramps up the difficulty considerably) before finishing my take on this.
I would say get it if you don't mind these aspects as it is a top notch RPG. Would I recommend it for a kindergartner to play? Well, not really.
“If the history of the 20th Century proved anything, it proved that however bad things were, human ingenuity could usually find a way to make them worse.” - Theodore Dalrymple