My mom says she is Christian, but really she "just believes" imo. Even when cornerd by her and my grandmother about my lack of spirituality, I would ask what makes them believe in God and and that Jesus is my saviour. Their response was basically "they just are."
So luckily my mother did not poses the powers of brainwashing and I am (and in my mind, always have been) a proud agnostic. I won't tell anyone they are wrong because noone knows for sure. I just personally believe that they are.
My dad has never said. The most he tells me is that his parents didn't raise him to be religious. Whether he thinks there is a God or not, I don't know. I do know he took an interest in Wicca with me in my teenage years though