Magic Forums

I am unsure if I am posting this in the correct section of the forums...
So, here's the thing: I no longer identify myself as Christian. Since I am done with this religion, I want to end whatever binds me to it through any way. According to Christianity, each individual who undergoes the Christianic sacrament of baptism is annointed with the Holy Spirit. Since I no longer wish to follow the religion, I wish to be rid of it (sorry if I gave the shudders to any Christian reader), since I find the fact that I might be carrying a spirit of unknown/non-trustworthy origin (for me at least) inside my body greatly disturbing. So, I wish to be rid of it.
But I more or less believe that this won't be as easy as shooing it off.
So...any suggestions on how to expel it?