Syncretistic thought produces egocentric speech.
A good example is that of a four year old child who wanted to be in the room with the adults after bedtime. Five minutes after the mom said goodnight, the child came creeping into the living room with his hands over his eyes.
In his egocentric thought processes, he concluded that if he couldn't see the adults, they couldn't see him.
That reminds me that I used to listen to a radio broadcast called the "Shadow" in which an adult made the same assumption. He was lucky he didn't get killed.
Syncretistic thought produces what Piaget calls Egocentric Speech. In egocentric speech, since the child is the center of the universe, the assumption is that people will understand what is said no matter how it is said, because "what the child knows, everyone knows."