How do i tell my family im bi there christan too.?

It's very difficult for you seeing that your parents are both so Christian and there is no easy way to do it. It might be easier for you to speak to your mom first, but don't expect any miracles. She will of course wonder where she went wrong for you to turn out to be bi. I am afraid you might be in for the whole Christian guilt trip, but if you are serious you need to stand your ground, be nice and be patient. She will give you a million bible reasons for your situation and you will probably feel really bad. Time heals lots of things, but I am sure because she is your mom she will still love you. Fathers seem to take the news a bit harder. Good luck.