The witchcraft god I worship is the Horned God Cernunnos. He is the guardian. The Horned One is a god of fertility, life, animals, wealth, and the underworld. Cernunnos is depicted with the antlers of a stag. He is born in the winter solstice, marries the Goddess at Beltane, and dies at the summer solstice to begin the cycle all over again. He is the guardian of the forests and all creatures within.
The images of the Christian devil are a culmination of several pagan gods, the horns from Cernunnos or Pan, the cloven hooves obviously Pans, the pitchfork he carries is the trident carried by Poseidon and Neptune, the forked tongue is Shiva, the pointy tail is Set. Of course these are bad interpretations of what the followers of these Gods understand their description to be.
As a witch Cernunnos is not a bad or evil god to us, he is the father of life and husband of the Goddess. He watches over his children and protects them from those who wish them harm. He is there to usher our souls into the Summer lands when we die to await our rebirth.
The Gundestrup Cauldron, dated from around 200BC depicts the most clear and oldest known image believed to be Cernunnos.