Hearing voices does not make you a demon. You just face some challenges that are unique to you. Mental illness is just that, an illness which is beyond your control. You're still a human being and your perfectly well-loved. Of course God loves you and He will continue to do so regardless of what anyone says or thinks.
I'm so sorry to hear that you are being called a demon for hearing voices. I want to tell you that it is not true at all, you are not a demon.
As a mental health professional with strong religious belief (Christian), I must sadly admit that sometimes some people within the religious community are misinformed or have misunderstood about mental health issues, and that makes them giving hurtful or even harmful suggestions to the person facing such mental health issues. It is important for us to recognise and learn about what mental issues are, and how we can help.
Speaking of which, I want to say I'm happy to hear that you recognise you are facing this issue of hearing voices. Recognising and admitting our issues or problems doesn't make us weak or bad, instead it takes a strong person to realise and recognise that we face problem, and we need help. I hope you can seek for professional help for you to deal with this issue. Finally, I want to affirm you that God loves you and He cares for you. Perhaps at this moment you may not be feeling like this is true, that He loves you, especially when you are still struggling with your issues, but I know that it is His plan that you can receive and accept this love, and He will make His love known to you. Do not stop getting help for the issues you are facing, and do believe that God loves you!
If someone answers this question, implying someone KNOWS the truth, I wouldn't recommend listening for an answer! When talking about God/demons/other worlds or dimensions, one has to realize that we simply do not know for sure. And it may not even be for us to know!
For what I feel certain enough is to answer the indirect question you provided. You are not a demon just because you hear voices. There thousands (if not millions) of people who claim to be able to communicate with spirits (or divine guides, or higher beings). If something, it makes you special and truly gifted. Please don't hesitate to speak with someone here if you feel like it's becoming overwhelming :)
Whoever told you this doesn't understand basic human psyche. And as a note, if you were a demon, don't you think you would be aware of it? No you are not a demon, you are just someone who was fed lies about yourself just so others can explain issues that they cannot.
it is highly unlikely that you are an actual demon. it is more likely that you are human. it is more feasible that you are being posessed or influenced by a demon. it has been said that the devil is a master of impersonation.
Sometimes people with a gift for hearing or seeing or sensing the spiritual realm get used. The Devil wants to use God's gift for us to his advantage! You are made in God's image. You are unconditionally loved. You have the Creator of the Universe or your side. If what you are hearing doesn't come with a sense of peace and love, it is probably not God. Even when God tells us to do hard things, he gives us a sense security that goes with it. The Devil and demons probably are trying to speak to you, but they speak to all of us, just some of us conciously experience it more! We can choose whether to believe them. If you aren't sure who is speaking, look in the bible and see how God talks to us. He speaks with kindness, strength, empathy and love. I'm so sorry someone told you that, it isn't true. You aren't alone. He does love you unconditionally.
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Related Questions: I was told I was a demon cause I hear voices. But then being told God loves me no matter what. Please what is the truth?