I don't believe in the mixing..or attempting to mix religions.
It's one thing to be of a religion and practice magick. It's something completely different to attempt to claim to be of two separate, seemingly unrelated religions for the "sake of magick".
As Esprit pointed out, you don't need to be Wiccan to work with magick.
There are many religions and traditions who incorporate magick into their teachings and way of life, however you don't need to be part of any of them to incorporate magick. Magick itself, has no religion or religious preference.
Don't feel pressure to change your personal beliefs simply because some people can't separate religion from magick ;)