Hey.
Regarding them eating from the tree,
Then We said: "O Adam! verily, this is an enemy to thee and thy wife: so let him not get you both out of the Garden, so that thou art landed in misery.
"There is therein (enough provision) for thee not to go hungry nor to go naked,
"Nor to suffer from thirst, nor from the sun's heat."
But Satan whispered evil to him: he said, "O Adam! shall I lead thee to the Tree of Eternity and to a kingdom that never decays?"
In the result, they both ate of the tree, and so their nakedness appeared to them: they began to sew together, for their covering, leaves from the Garden: thus did Adam disobey his Lord, and allow himself to be seduced.
But his Lord chose him (for His Grace): He turned to him, and gave him Guidance.
He said: "Get ye down, both of you,- all together, from the Garden, with enmity one to another: but if, as is sure, there comes to you Guidance from Me, whosoever follows My Guidance, will not lose his way, nor fall into misery.
"But whosoever turns away from My Message, verily for him is a life narrowed down, and We shall raise him up blind on the Day of Judgment."
[Qur'an Ta-Ha 20: 118-124]
So the tree wasn't the tree of knowledge, infact knowledge is praised in the Qur'an and in Islaam. So i don't know where that idea came from. Satan decieved them by saying that it's the tree of eternity and of kingdom. But we see later in the verses that Allaah forgave them since the son of Adam is prone to sin, but the best of sinners are those who repent sincerely and return to the guidance.
In regard to your other questions;
I think it's quite logical that people are inclined towards good, and that is a sign of the fitrah - since the religion itself supports doing good. i.e. helping the needy, feeling sympathy, enjoining the ties of kinship, giving in charity etc.
The question might be why we need so much in depth rules and regulations within the religion, this has been explained in my previous post where i stated that if someones fitrah was to be altered by the society around them - then they would have a Criterion [i.e. the Message] to refer to so they could go back upon the fitrah.
Obviously there are other details which may be specifically within the revelation. I.e. marriage is something which is permissible in Islaam, yet how the marriage contract is done is within the revelation. So the details are required from the revelation, and the fitrah agrees with that since Allaah has created us that way i.e. the revelation is logical and in accordance with the sound fitrah.
In regard to your question about believing in God being part of the fitrah, i'd love to see a child brought up in a natural environment without any interference from theists or atheists, and see if this child would believe that there is a Creator of the place where the child lives, eats from, breathes, drinks etc.
And Allaah knows best.
Peace.
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