They were created as adults, so they didn't have a childhood, without going through a childhood is one an adult? Ok so their magic adults without parents.
Obviously god showed adam and eve where the trees were, if god hadn't done this with a purpose, the two of them would still be in there without finding the tree.
God put a decietful snake in the garden, either you think god is dumb, or god did this while knowing what would happen. If god made an agreement with the snake and appeared to punish it, man wouldn't see any reward the snake would be getting (such as ruling the underworld without any interference from god).
Distance in the garden does not matter, man had nothing to do, whether it took the two of them a few days or a few thousand years to run into the tree and the snake at the same time it was bound to happen, your god isn't dumb he knew this would happen. It was his will for man to be damned, otherwise this terrarium would be boring for him to watch.