What ever religion you practice, thats what you are. That kind of stuff does not hand down like your nationalities. If you want to practice Buddism, then you can call your self buddist, even tho your mom and dad were christen.
I just think that religion should get passed down like that. Like I am an athiest, but my mom and dad are christen. But I would not consider myself, or my kids (when i have them) christen.