The truth of scripture is that God created evil to humble us, but all God's creatures will eventually be reconciled to God through Christ's blood on the cross. Don't be deceived into thinking there's any such thing as "eternal torment" in "the lake of fire" or "hell" because an accurate translation of scripture doesn't say that. I think scripture is a more reliable source of truth than the tradition of man that's come to us through the Roman Empire which the Protestant Church neglected to purge. You don't have to fear demons or even Satan if you believe God. When Christ was confronted by Satan in the wilderness, he simply kept quoting the word of God until Satan left him. Satan even used the word of God with a distorted interpretation to try to con Christ, but Christ just kept quoting the word of God to counter Satan's deception. The power you need to feel confident about standing against the demons that are tormenting you is the spirit of God that comes into you through the inspired written word of God. I suggest you read it daily, and I suggest you concentrate on Paul's epistles because they're about the grace of God that specifically applies to those of us of the nations, the ecclesia, the body of Christ. Evil will eventually be nullified at the consummation of the eons, but, until then, we have to deal with it. Atheists are confused about evil and helpless to defend against it because they have no faith in God, but even that is according to God's will because only some have been chosen to be saved in grace through faith. The good news is though that even atheists will eventually be saved because God is the savior of all mankind, and God's plan is not to torture the majority of mankind in fire forever because God's ultimate plan is to be all in all.
"we rely on the living God, Who is the Saviour of all mankind, especially of believers" (1 Timothy 4:10)
"through Him to reconcile all to Him (making peace through the blood of His cross), through Him, whether those on the earth or those in the heavens" (Colossians 1:20)
"Yet now Christ has been roused from among the dead, the Firstfruit of those who are reposing. For since, in fact, through a man came death, through a Man, also, comes the resurrection of the dead. For even as, in Adam, all are dying, thus also, in Christ, shall all be vivified. Yet each in his own class: the Firstfruit, Christ; thereupon those who are Christ's in His presence; thereafter the consummation, whenever He may be giving up the kingdom to His God and Father, whenever He should be nullifying all sovereignty and all authority and power. For He must be reigning until He should be placing all His enemies under His feet. The last enemy is being abolished: death. For He subjects all under His feet. Now whenever He may be saying that all is subject, it is evident that it is outside of Him Who subjects all to Him. Now, whenever all may be subjected to Him, then the Son Himself also shall be subjected to Him Who subjects all to Him, that God may be All in all." (1 Corinthians 15:20-28)http://www.saviourofall.org/charts/ChartOfJudgments.html