Coral, may I bring up a point re your statement
"if you believe your a christian then you are a christian".
People of the Jewish faith believe that Christ was a prophet, yet they don't accept him as THE Son of God; the Messiah. These people aren't "Christian" just because they believe He lived, right?
I'm an American citizen married to a Scotsman with a Scottish last name. It doesn't make ME a Scott, does it?

Yet, I can legally call myself Mrs. I**** because I have a legally binding document that says I can since I made some commitments.
The Bible says that many will call "Lord! Lord!" but he won't know them because they haven't accepted him truly as their Lord.
IMO 
, you have to know the Man and accept him for Who He is before you can call yourself by His name. What do you think?
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.