Those who believe will know and see. Those who don't will most likely have some experiences; however, they dismiss it or come up with a "logical" explanation. I follow The Warren's (demonologists) perception of spirits, which is, we should acknowledge there existence and that they are there, but interacting with them and giving them the attention they crave can be dangerous. Realistically, we do not know who we are communicating with. Even though we may see a child or hear a child through an EVP, there is no concrete way to determine that is what it is.
Example: I was haunted by a demonic entity at a townhouse I lived in. I'm sure it was drawn to all the tension in the house as my ex and I fought all the time...so a great place for a demon to spread oppression. I would wake up early every morning to hearing the sound of my son screaming (at the top of his lungs) in his room. He was a baby...so I'd run to his room and check on him...he would be fast asleep. I'd lay down and get almost asleep and would hear it again. This happened every morning several times in a row. It wasn't until I saw the entity, I realized I was being toyed with. Suddenly I realized why I was afraid to fall asleep every night. I saw a black figure/ball move from the living room to the bathroom. My son began crying and screaming and did not want to sleep in his room because of the "Eyes" near the window. Needless to say, I took my son, myself, and left.