Being a Christian requires more than we even know, that was why the demon asked when tired to be cast out in the bible it said Jesus I know, Paul I know but who are you? In that being a Christian means being washed in the blood of the lamb, being sanctified and saved by grace.
For you to be a Christian, you need to ask for God's forgiveness on your life, you need to accept God, and be Willing to allow him Into your life