I am so sorry your so called "friend" did this to you. No one on this earth can determine whether you are christian or not. You did not deserve that. I barely know you but I already think you are a loving and compassionate friend.
Speaking of Christianity, my mania always turns ugly. It's starts as beautiful euphoria but turns into nasty, confusing, chaotic paranoia. When I am paranoid I start to think that everyone is against me, or the biggest paranoid thought, that I am going to hell. A few years ago I had a psychotic episode where I was extremely hyper religious and I did all sorts of bizarre things in the name of the Holy Spirit. I believed I was chosen (especially) by God. Since then, my once very close relationship has practically dissolved. I am worried that practicing my faith will lead to a psychotic hyper religious episode again. Since I don't have the relationship I once had, my views and often my behaviors are not Biblical. I am not usually worried about it because I know my relationship is slowly being healed. However, when I am paranoid, I become tormented by thoughts and sometimes (internal) evil voices telling me I will go to hell. It is a scary place to be!