I think that it's best if you could ask someone from your own church to do that for you. I believe your order would frown upon you if you did not, as there are perfectly capable people among your own faith.
Sincerely,
Alleina
// Actually, I believe that's not 100% correct. If I'm not completely wrong here, it doesn't matter what alignment you have to create the amulet to work for everyone. They are all called "Consecrated Holy Symbol" (Someone, please correct me if I'm wrong here!).