How do you forum posters explain that evil exists despite God being, all powerful, all knowing and all love?
Why does God permit or create evil? Or did God not want it for anything? Is evil and illusion?
Why did Jesus create the situation of the crucifixion and go through that? Why does the victory of death and Satan, take so long to fully establish?
Will the fallen angels and souls ever repent?
1. First you must distinguish what you mean by "evil". Specifically there is moral evil, which we would call sin. There is also what has been called "natural evil" which is not sin, but rather it is suffering, calamity, misfortune.
God does not create moral evil. Everything that God created is good by nature.
Evil is not a positive thing, like light or heat, or matter. It is a privation, like darkness, cold, or emptiness. Evil is not a thing in itself, there is no object out there in the world that is "evil". Evil is an adjective, or a state, specifically it is the state of lacking or being deprived of what you ought to have.
God created human beings to be loving, honest, kind, brave, noble, etc. He also gave us free will, which means we can choose to embrace or to reject what God has created us to be. We can choose to love, or not to love. We can choose to be honest, or not to be honest.
When a human being lacks love, that is evil because they are not being the fullness of what they were created to be. When a human being is not honest, that is evil and so on.
In all such cases, human beings are called to be good and to possess and act from goodness. When we choose NOT to do those things, we lack goodness, and that is what evil is.
God did not create evil, because he did not create us with lack or privation. He created us with perfect natural goodness and we chose to give it up. Thus we created evil, not God.
2. God did not create evil, we did. However, God permitted evil because the possibility of evil is essential to the perfection of Goodness that God intended. God wanted to create us as free moral agents who are capable of love. In order for us to be free moral agents capable of love, that means that we must be capable of choosing love, and if we are capable of choosing, we must also be capable of choosing NOT to love.
Evil is not an illusion, and it is necessary in a sense, but not in the sense that people often think. God deemed that the price of evil existing was worth the goodness of us existing.
He decided that you existing was worth the price of allowing evil to be possible.
This also reflects the principle that God would not and never does permit an evil, unless he can and will bring a greater good out of it. Thus he has deemed that the goodness of you existing is so great as to make the possibility of evil worth it.
3. There are several different answers to this question. The central point of the Crucifixion was to demonstrate the power and perfection of Love. Many Christians mistakenly believe that salvation is the result of how much Jesus suffered. In reality, salvation is the result of how much and how perfectly Jesus loved. The suffering was just a means of demonstrating his love and his obedience.
In the fallen world Love is virtually inseparable from suffering. Love almost always bring suffering and it is often actualized and proved by suffering. But love also makes suffering meaningful and bearable.
The victory over Satan and death is not what takes a long time. God could defeat them with a thought. In less than an instant.
What takes a long time is human beings to be born, grow, learn, etc. The time that God has allowed is not because it was necessary to conquer Satan, but because it was necessary for many people to be brought into his family.
4. The general teaching of Christianity for most of its history is that it is not possible for Angels to repent, because they make their choices will full knowledge and understanding and as a result they never change their minds.