because parallel light cannot be an an single to cause this type of light spread.

The sun does not push out parallel light. It's a glowing ball of nuclear explosion and light comes from all the parts that are visible. So no, it wouldn't create a crisp shadow, but an umbra.

if you want, you can do some flat earth research so you are just speaking from one side of knowledge. its too easy to debate this.

The problem is that you are asserting laughable garbage.