For those who believe in demons, they tend to believe that someone either invited them in, damaged their own soul and became susceptible to possession, or did some kind of risky activity that allowed them to enter, often while being in certain places where demons hang out.
For instance, a person might have been in a bar, which is one of the preferred places of disincarnate spirits. While in the bar, they would likely also be drinking alcohol. Just like there are people who prey on drunken people and do really bad things to them, there are demons or other spirits who will take advantage of such people and possess them against their will.
Here is a list of proposed things that may be involved in demon or spirit possession or any other sort of entity attachment:
1. Substance abuse. If someone is drunk or high, it may make them more susceptible to entity attachments.
2. Bad places. Undesirable spirits are probably more likely to congregate in places such as graveyards, hospitals, prisons, bars, and rough urban neighborhoods. So if you are in a weakened state, such as from substance abuse or certain extreme emotions (eg.: lust, rage, hatred), then you might be more likely to pick up spirits from such places.
3. Vows and pacts. People do from occasion attempt to sell their souls to the Devil, demons, and other entities. So if that actually happens, then it makes sense that they would stay attached in order to live through you or make you keep up your end of the bargain.
4. Pledges and dedication ceremonies. There are large influential families who pledge their children to entities or spirits, since that has been the family tradition for so long. So the families are giving the spirits permission to indwell in their children.
5. Dabbling in the occult. Messing with occultic practices can open portals into the spiritual plane. The ouija board is commonly associated with entity attachment problems. The real life equivalent would be opening your front door in the middle of the night and yelling out for whoever wants to visit you to come over. You might get some visitors that way, but they might not be the types of visitors you want, they might cause trouble for you, and you might have a hard time getting them to leave. The supernatural realm isn't much different.
6. Violating your deepest principles. Doing things that you know are wrong can weaken your aura. Then in turn, unwanted entities can more easily enter your personal space. You might work for a place that is forcing you to do things that you know are wrong, and rather than stand up to that and/or seek other work, you keep quiet and do it anyway out of a fear of getting fired. Then it may damage parts of your aura over time or cause some soul loss. So you have gaps in your energy field and undesirable entities might try filling the gaps. This may be why there is so much corruption in politics, prisons, the military, police forces, and other places where there's strong authority, including even the church. Such people were forced to compromise who they were and that allowed undesirable spirits to enter over time.
Another answer from our community:They pose as people to bring people to Satan(the devil)
Catholicism teaches that Satan and demons are real entities that exist. They are fallen angels. Satan is the leader of the demons. They can possess people. They wish to harm human beings.
it is a way to explain the punishment of evil people.
Roman Catholic AnswerDemons are fallen angels who can possess people, thus devils; so you can assume that is what was possessing Mary Magdalene.
People go to the demons with an aim of making profits
You can't possess anybody. That is a lie spread by the Christians and the Jews. Demons don't possess people either. Angels (enemy Nordics) possess Humans sometimes because they are very evil. If you are under the protection of Satan however, you will not have to worry about that. Hopefully you aren't a Satanist because you think it's cool, or think you are "evil" in any way.
Yes they are real follow this link to know about demons youtu.be/KiQCgEkAaQ8?si=sJkhIhSx2fjbnuYL
The Church teaches that the devil is a real entity. He is a fallen angel. Demons are lesser fallen angels. Demons can possess living persons.
There are no such things as demons. It therefore correct that they can't follow people.
Demonic possession is usually a means of gaining control over human affairs, or affecting the lives of people, both those possessed and those around them. Priests and specialized clergy still perform exorcisms designed to remove demons, but the belief in these entities has waned in modern times.
You need to do some research - writers do a lot of that! - and learn all about different types of demons so you can figure out a way to do that on your own. Using someone else's ideas will leave you at risk for getting sued if you sell the story and start making money. HERE is a link to a question about writers and story ideas, too.
It means a devil realionship or a bad spirit. People that possess this name usually come from a bad place in life, and have demons watching their back, which eventually leads to succes.