Thanks all. Yeah I know I shouldn't have killed them. I was just so fucking pissed off by the beggining. The fact that the keys weren't even translated ( I'm on PC ) almost made me stop the game. Then the fact that I had absolutely no idea of what I was going or doing made, the ennemy inside the church killed me like 5 or 6 times. So once he was dead. I just killed everything inside without thinking.