How do I come out of the broom closet to my christian Grand mother?

Uh well my grand mother is the wildly christian type of person and I am pagan. I have been pagan for around two years and I think I am ready to come out of the broom closet to my friends and family. Though I think most of my family will understand my Grand mother is the problem I don't know how to tell her. or if it is wise to come ou to her in the first place.