Do demons have physical forms?

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A spirit I encountered has taken two, or something it works with/for has. It has possessed me and made my knife able to cut through thick glass like it was nothing. And my nails able to cut through plastic.

The spirit has helped me and hurt me. It has also healed me of physical damage to my body with out me asking.

I think it might be a demon. How do I get rid of it? When I believed in the Bible exorcism didn't help. Did nothing at all. Tried 2 guys experienced in it, and tried it myself. It does not leave in Jesus name. Don't believe in the Bible any more due to noticing contradictions in it, and since I believe eternal torture is evil. I don't think God tortures things forever since I know he's not evil.

When I was high and dumb, i allowed it to bind it's self to me or my soul I think. How do I unbind it? If God even allows us to bind things to our soul. And how do I get rid of the demon? I want all demons out of my life.