Satan is the deceiver ..his role is to take the eyes of men off the God of Scripture .In the OT Pharaoh’s magicians performed miracles
Jesus tells us this Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?' Mat 7;22
“For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ. And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works” (II Cor. 11:4, 13-15)
"And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live." —Revelation 13:14
"For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty." —Revelation 16:14
"And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone." —Revelation 19:20
Are you seriously suggesting that people being cured of cancer and alcohol abuse is the work of the devil because they prayed intercessory prayer to The Blessed Mother?
I really hope you’re not suggesting such a thing.
Those verses alone would make me cringe were I a member of the Catholic Church.
“Every good endowment and every perfect gift is from above, coming down from the Father of lights with whom there is no variation or shadow due to change.” - James 1:17
The key words there are “good” and “perfect”. If you re-read the verses that RnMomof7 posted you will notice that Satan’s ministers were transformed into ministers of righteousness. They were deceivers. Still they were able to perform the miracles. Be not deceived, God is not mocked.