Which hasn't happened yet, and still has a long ways to go. Considering many things that still have to be fulfilled. I believe the devil, Satan, is around, not that I want to worship him, but because what the bible of God's words say. You're one of those Christians who don't think there is a devil/Satan, and a preterist. You have a form of godliness but deny the power.
Peter says how the devil walks about as a roaring lion seeking who he may devour. Paul says to not give place to the devil. Both Peter and Paul who God used to preach things to the people. Jesus said the devil is a thief who comes to steal, kill, and destroy, and he wants to swift you as wheat. The bible talks about God being the creator of everything. Everything that is his power. God created good and evil on the earth and other places in the universe. Ephesians chapter 6 talks about the war that the body of Christ is up against; principalities and powers, spiritual wickedness in high places, the rulers of this world. Those things which are under God, as God is the creator of all things, and everything is made for him. This is explained in Colossians chapter 1. God created good and evil, and gives people a choice what they will do. This is explained in Chapter 45 of Isaiah. God would prefer people to do good, but it can't be done without Christ in a person's life.
Satan does things in peoples lives. The book of Job demonstrates this. The devil exists to tempt people and try to lead people to do evil things. Both those who are lost in the world and those who are in the faith. When you're not following the ways of God or doing things contrary to God, then God may send evil on a person or reward someone for their doings. The devil also goes to God to tell God that he wants to do stuff to people. God can decide to let/allow Satan to do things or not.
There are demonic powers that are behind the evils and the darkness in the world. The scriptures point out to this. To deny this is to deny God's power and an element of truth to God's words.
There are many false or bad doctrines. Teaching that there is no devil or aid an enemy who comes against the partakers in the faith is the worst of them all.
The sad thing that comes to my mind personally, it has to deal with the ability to accept that Satan has been done away with as the Scriptures proclaim. That was exactly what Jesus had came to do was to destroy the works of the Devil. While the Devil is the opposite of God, us has human beings are naturally intuned with doing anything and everything without God, if it is possible. As human beings, we are our own worst enemy. Just as Peter, had his mind set on the things concerning earthly ways, and not heavenly.
From my perspective, which again is up for acceptance or rejection is that Yeshua/Jesus, the Messiah had come and completed his mission in full, without the need of a supposed second coming in Modern Society. While there are many views that hold that the devil has yet to be defeated and so on and so for, what does that Bible state concerning those things?
From looking at what the Bible proclaims and makes clear, is that even in the Revelation which the 7 Churches in that day in age had circulated amongst each other, and had strict and direct warnings concerning the coming of the Lord, and when the instrument of destruction I believe was Roman, came in and destroyed Jerusalem utterly, and that in my opinion and perspective, is enough to co-relate the Roman and Jewish Wars, which are documented under the documented historian Jospehus.
To me, the Devil all along was incomposed by how evil, and how out of the way the people of Jerusalem had went, tagging up with Rome, and of course, Killing the Lord Jesus Christ of course. Though, when it comes to these notions, they are so typically overlooked, such as when Yeshua, stated "Who else could come in to bound the strongman, but the one whom comes in after?"
Founded in Matthew 12:29 For who is powerful enough to enter the house of a strong man and plunder his goods? Only someone even stronger—someone who could tie him up and then plunder his house.
To me this is signifying, the power of Jerusalem, with all of there High Priest, Elders, And those whom Jesus was going to be handed over to, in order to "destroy" the works of the devil. Was in store...
This is why I believe like I do, I have taken time to really consider what has been foretold to the people of the time in the day... The Devil, over all in all, was and could be consider HEAVENLY ISRAEL - Oh Gods Chosen people! Founded on Earth, in that day, when going to the temple, and "Yahavah, himself by and through smoke, would show himself, especially when the sins of the people had been forgiven." The inner people, and the most inner and the outer all celebrated.
But those sacrifices there were all done not always correctly. Earthly Israel, which came from Abraham, whom came from Adam, to who was it that ruled over Egypt with Pharoah and getting great treatment, until he was forgotten? Abrhama, Isacc, Jacob (Israel), Israel did become great, then Jesus came, and destroyed the Devil,
and it's works which was all done based on the influence of the Self, and not anything of God, and Yahavah, showed the one to truly have been the Son of God, though there had been many people of faith whom were of faith sons of God, or daughters, even today and then,
but now we all go through Yeshua, whom allows us to be adopted by the Father, if we so seek in faith and trust in him and look towards him, and seek him to help us in this life as we go by the holy spirit, cause without the Lord Yeshuas, none of us can do anything of our ownself as far as good. It's only by Yeshua, whom helps us, overcome
... the devil? Not exactly, but ourselves, our doubts, trials, mistakes, choices, all of it that comes and involves doing things on our own accord or actually relying on Yahavah, in faith, and trusting him as our Father taking care of us, and helping us daily to get through the issues we all have and he and his Son knows, cause we do not have a High Priest (A priest who is not corrupt), but whole, and holy and is the one who grants us access to the Throne of Heaven, where Yahavah, sits upon the throne, also with his Son whom had overcame all things, and sits with him.
To much? If it is, that is totally understandable. If you believe that the Devil is still around, cool. I don't think people are wild to continue to believe it, but I do find it wild not to believe what the Bible had forecast for us now in this time to live by the heavenly means, entering life in a newness of life through Christ, now living on earth, by the heavenly gifts bestowed and helped in us being faithful, kind, patience, at peace, to stick and pick truth over distruth, etc...
Just because a person may not have the same perspective as many other people, it doesn't mean any of this shared information is invalid, or of the devil, or whatever a person may concur with. Just Matthew, writing out the way he sees things, and that doesn't mean people have to believe me, cause they never should. They should be encouraged to seek and search and look for truth, even things which perhaps are uncommon to people whom are more common to the more louder views, than the other relatively scantly views such as this one.
By all means, I believe that darkness exist, and that everyone is capable of evil, if they so let their hearts desire and confound in the choice, no matter the state of mind, etc... but God is merciful to those who even do the most evil of evil as some people categorize such things.
All the best to you.