The targeted demonic attacks we experience especially in this holy season are real, and we can spot them because of how they are so specifically designed to pull us away from participating in it. But these things do indeed come out by prayer and fasting.
However you want to understand why there are demons on the earth even now, it is true that they are real and they are present. It is true that the suffering of this world is closely associated with their activity.
This world has many dimensions that we do not see. And they would be frightening if the Lord opened our eyes fully to their reality.