2 Thessalonians 2:9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
Revelation 16:14 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.
1 Timothy 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
We are to test the spirits to see if they are from God. If they do not give glory to Christ it's not from God. This entire article gives credit to those so called "saints".
If God still is in the miracle business, what do you suppose happens to those who, for whatever reason or motivation, call the work of God the work of Satan?
Why would Satan do miracles that people then believe are proof of God and strengthen their faith and belief in God?
Seems like that would work against him and his own interests. Why would Satan do that?