You are not killing people in a video game...that's foolish to think that. They are simple characters of folks..but not actual folks. The big question is your own feelings/beliefs about the violence contained in such games. Personally i do not allow my younger daughter(10) to watch things like the aforementioned game( i play them when she is elsewhere)...when she turns 12 i will evaluate how she handles things..but at 10 she is quite vocal about what she wants to see and what she doesn't. Listen to your kids..but do not be afraid to jsut say no.At least in terms of children playing, if you're ok with your child killing people in a violent and graphic manner (like, say, in a war like Battlefield V), chances are you're confident that your child has the proper moral compass and intelligence to know that something being called 'Holy Ghost' is not representative of Christianity or even related in any way other than the name, in the same way you are confident them playing the game isn't going to twist their mind and make them want to go out and kill people in real life.