The demons will not be reconciled at the end of time. That is theological nonsense. The fall of the demons is irrevocable (which is due to their nature and not a defect of God’s mercy) and thus they cannot be in heaven - ever.
I agree the demons and satan have been permanently separated from God. They can’t utilize the forgiveness of Jesus since they have been separated from God. They will burn in Hell forever along with anyone who also knowing God exist rebukes God and sides with the devil. So if satanism is not the worship of satan it is still following the basic principals that satan himself has set up. Living to please your human(fleshly) desires more than living to please and love and worship God.
We Christians believe that we must lose our flesh(our humanly desires) in order to find and refine our Spirit. This thinking that it is okay to live for one’s pleasure is only another way of saying I don’t care if I separate myself from God, its all about me. Satanist, from what I read in this forum believe that it is okay to please oneself as long as it doesn’t hurt anyone. The repercussions of that thought process actually does hurt, it hurts God who created them and loves them in spite of themselves.
The growth of the Spirit is so much more fullfilling than fleshly pleasures. But I don’t expect any satanist to understand this as they could not possibly know what spiritual growth feels like. They are too busy pleasing themselves in a fleshly manner to understand the concept of losing the flesh to grow in the spirit. I will pray for all the satanist in this forum that they may be touched by the Spirit of God and thus realize the Truth the way and the light - The Father , The Son and the Holy Spirit.
I also feel that the reason the satanist are even on this forum is because deep down in their soul they have that tiny mustard seed of faith compelling them to find the truth. To search for the reason they are so busy trying to please themselves. They say we give to the poor and do charitable things to please ourselves and it does please me. But the compulsion to do charitable acts is not driven or perpetrated by knowing that it will please me; it is because I know it will please God and help the world. Did Mother Teresa spend her life because of a dangling carrot? Certainly not the dangling carrot at all, she lived her life to help the world and thus please God. Did she find joy in that, yes, but not a carrot.