Satan is capable of doing miracles as revealed in Scripture. The apparitions of Mary at Lourdes and other locations could very well be satanic deceptions. Also, there are many who go to shamans, witches, and witch doctors and get healed. But we do not know the end result. However we do know that it is forbidden to pray to anyone other than to God the Father, through, and in the name of, God the Son, and by the help of God the Holy Spirit.