Is the soul of a human, different than an entity?

The soul is an entity in the same sense that our body is an entity. Both entities united with each other created the entity known as a human being.

In my opinion, a soul is not an entity. God doesn't watch each and every human being at the same time and cannot live with each and everyone to guide them. These works are done by the spirits. God had created different kinds of spirits for various purposes. He had made the spirits to watch, guide and determine the destiny of the human beings from their daily activities, talks and thoughts too. Your past determines your present and your present determines your future. God has given freewill to all creatures including human beings. According to this, all human beings have all right to live a life as they wish. But if it happens to be bad and hurts someone, they have to face the consequences. These consequences are created by spirits. It's a natural system. After death no one lives in any form. Heaven and hell are only for spirits, not for human beings. God is a mystery even to the spirits. Spirits are not eternal beings but their lifetime is long. Spirits are separate elements. A human being during his/her lifetime is living with many spirits which have joined one by one since birth. They are knowledge, skills, feelings, emotions, interests and everything. These spirits are your consciousnesses and memories. Even thoughts are not your own. For example, when you want to take a decision on a subject, one after another the spirits think and you just listen, choose or reject the ideas which they transmit to your mind through your brain in the form of thoughts. Brain is just a media to connect the spirits to your mind. A mind is just a computer's mind. A mind is you. After the destruction of a computer completely you will not get its mind. The same is the case with the human beings.  A human being doesn't have a spiritual body. Soul is nothing but an energy needed for the functionality of a body. It is not a spirit or anything else. A body's functionality is based on the auto mechanism.  After death all spirits which accompanied a person quit and go to different places searching new bodies. No one lives after death in any form. All human beings are just robots made of flesh and bones and toys of the spirits for their games.

Yes, The human soul inherits freewill, with being aware of mortality, and the capacity to seek out the source of our existence.  

1).When you sell your soul, you are open to entities.  

2).The moment you take your first breath outside the womb, the soul has entered the body

I don't know. I'd have to check the Entity-Relationship Model Diagram to make sure.

Flesh + Spirit = Soul.

Gen 2:7  And the LORD God formed man of the dust of the ground (FLESH), and breathed into his nostrils the breath of life (SPIRIT); and man became a living soul (Flesh + Spirit = Soul).

All living creatures have souls and they are all equal, humans are just another Animals.