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Demons are real but you cannot kill them. The reason for that is due to the fact that they were never alive to begin with. In other words they may have a body but they have no soul or connection to a life once lived if that makes any since. The most you can do is send them back to hell. You can fight them although i would not suggest it be done by you personally.
First thing in fighting them is finding the reason they are there to begin with, Such as a person, object or just to cause mayhem. There are many different types of demons all have different purposes to serve. The fighting tools most commonly used are holy water, a holy bible and a cross. What you can do is have the home or area blessed making crosses on each door or perimeter with holy water. Often times making a circle of salt around a place where a demon is said to be like an entire home is said to cast them out.
Burning incense can also do the trick. All these are meant to cast evil out. As far as sending a demon back to hell is a bit above me but i heard of people getting the help of a priest for things like that. I would not recommend taking on a demon by yourself without the help of a priest because you may not be spiritually strong enough to handle it, If you are not then you can become easily corrupted or possessed by the demon.
Please head the warning and call for help by a priest or someone specialized for the job if you have a problem with a demon. stay positive!