Witchcraft Vs Paganism: Where does Religion end? And where does Wicca begin?

There is a crossover in the witchcraft community, as to where does witchcraft begin and paganism end? Can there be a crossover, and can you be both? Well its both a yes and a no answer, because of the open-ended definition of paganism, and how its cultural impact has influenced the witchcraft community, and how witchcraft has branched away from the religious definition it perhaps once had.