Not everyone has an entity. Which is why there is no need to develop a phobia about them, or to constantly try to protect yourself against them. People who have a neurotic tendency to worry about catching diseases must be reassured on this point. In normal situations, there is far less chance of catching an entity than there is of catching a viral or a bacterial infection, for example.
People take in viruses and bacteria all the time through the air they breathe and the food they eat.
The human system has very solid energetic mechanisms that do not allow the penetration of foreign presences. It is only in exceptional cases that the penetration of an entity is possible.