Greetings Newfag,
You would do well to get more educated on Paganism, Religion and History in general before creating threads like this.
The word "Pagan" predates Christianity. It comes from "Paganus", a latin term used by romans to refer to the religious practices and superstitions particular to the countryfolk.
Later, it was used by Christians to refer to non-christians because Christianity was initially a mainly urbanite religion, having particular difficulty in being accepted by the countryside, only making real progress in this regard after the 11th century, and in many places even later.
It eventually grew to mean anything non-christian (e.g.: Iberian texts referring to Muslims as "pagans"), and recently retreated back into referring to pre-christian practices. Although this term has been muddled by the rise of contemporary "new age" practices that refer to themselves as pagan (e.g.: Wicca) but which have very little in common with pre-christian faiths and have completely different roots (since these practices are almost exclusively post-WWII and stem from an exoticism of non-semitic faiths, in a greatly demoralized and decaying society).
tl;dr: read moar, lurk moar