I no longer believe in the devil. But even if the devil does exist, to marginalize him is to disarm him. If the devil exists, he has no power other than to try to convince you that he has power.
Some people believe that being a spiritual person requires a staunch belief in the devil, on par with belief in God. Their fear is that if they ignore the devil, he’ll be able to get a foothold in their life. But the truth is there’s almost certainly no devil. It’s just a metaphor for a side of ourselves that we don’t understand. We are our own enemy.