Why don’t demons actually exist?

Animals nurture and yet allow freedom for their young to choose ways. If your child was born an adult with adult knowledge and wisdom would it be a complete being? Or what if you never allowed your child to get hurt, cause pain to others, make others sad or laugh or give joy?
There is a lot needed in experience and not just for individuals but for species as well. Change the above child to species.
We guide our children but, we cannot overprotect. We nudge here and there, we change things sometimes.
Any entity or entities developing a new species would know to allow true experience not just knowledge. Love is not easily described even by those that have experience.
Would an entity/entities leave us alone and observe after creating us or any sentient species or, or any evolving species?? Well there must be at least one reason for creation , so what could that reason be or reasons? Could be entertainment, could be education, could be an eventual equal or servant species. Could be successors. Could be some incomprehensible reason.
All of that would decide interference or leave them alone.
Sometimes there are inexplicable jumps in knowledge, then there seems to be backward leaps. What motivates these? Simply us trying to grow? Probably but, there is a lot of questions that are unanswered about weird things showing up. Energy, paintings, carvings, life forms.
An energy entity can affect without notice or otherwise.
Our earth is young in this universe. Why is a form of electrical energy vital to brain function??? Chemical is needed now but, will it always be so? How does entire TV shows travel through a cable or air or radio travel through air?
The biggest question I have is why religion? If entities control why need religion and its bigotry? Growth, challenge, overcoming the bigotry increasing it? Could it be an effort to split a species into true evolved beings, different yet same just like siblings or just cruelty ?