The JWs are quite paranoid about demonic activity. Some JWs (though not all) will not even buy used items at garage sales because they are afraid that demons attached to such items will haunt them and their homes.
When I was a JW years ago, the Smurfs were the latest demonic thing that a good JW would not have in his or her home. There was even a story of sorts that went around the JW gossip mill that someone brought a stuffed Smurf doll to a Kingdom Hall meeting and the Smurf doll screamed and floated out of the building. This story and others like them confirmed for the JWs that the Smurfs were of demonic origin.
Former JWs like myself who leave the JWs and then assist others in leaving the JWs (they call us apostates) are considered to be under the influence of demons. This is why many JWs will refuse to speak with us or hear anything we have to say. If you want to see what JWTruth thinks of people like me, check out his video on Disfellowshipping.
And, yes the apparitions of Mary that are approved by the Church are considered to be of demonic origin by the JWs. So the pictures I have of Our Lady of Guadalupe in my home would be viewed as demonic by JWs as are most Church buildings and the images in them.
For example, my grandmother who was Catholic and became a JW destroyed her images of Jesus and the Saints when she became a JW. My mother-in-law did likewise. This, of course, was encouraged by her JW teachers. Rosaries would also be considered of demonic origin by the JWs as well as the crucifix and most other Christian images.
The great irony in all this is that the leaders of the Watchtower Society particularly Charles T. Russell and J. F. Rutherford have dabbled in the occult. Most JWs have no idea about this but Russell actually helped to get a book published that was written by a spirit medium who channeled a demon that supposedly wanted to repent and return to heaven. The title of this book is “Of Angels and Women”. Rutherford and his crew actually published information on this book in The Golden Age Magazine (a forerunner of the Awake! magazine) encouraging Bible Students (as the JWs were known back then) to buy these books and give them away as Christmas gifts.
In addition, the Watchtower Society leaders taught (until the 1930’s I believe) that Jehovah lived on a star in the Pleaides constellation. The Pleaides is important in astrology and of course astrology is tied to the occult.
And, Russell was involved in pyramidology and used the measurements of the Great Pyramid in Egypt to support his belief that Armageddon would come in the year 1914 A.D. He believed that the Great Pyramid held the key to unlocking the secrets of God. The Bible Students promoted these things up until the 1930’s I believe and some New Age pyramidology groups of today can trace their beginnings back to Russell if I am not mistaken. Eventually the Watchtower rejected pyramidology.
I thought you guys might find this interesting.