You cant become a demon. No Mather how hard you try.

When you die you stay dead until God resurrect you for your final judgment. Its either life or death my friend. That is what the resurrection and judgment is all about. There will be no demons or devils in Gods new heaven.

Knowledge is not love my friend. Knowledge makes you imagine to much evil. Only Love will give you the knowledge where there is no evil.

There is a way of becoming a demon, and it takes your entire life to complete the rituals. Which rituals i do not know. But there is a Satanic society, in Croatia and they have the rites of how to do it. But as i am told they are forbidden to give it to any one. They call themselves Mysterium Aloim and they deal with deep mysticism.