What the...!?. He would go to heaven because the god would know that isn't his fault and would forgive him plus he didn't do anything bad.
Now a human being that lives separated from any foreing contact since it's born would be just a blank being that isn't even aware that he's alive, he will never know nothing about anything, and just act by instinct, learning could come with that but since he's isolated from everything... it would never develop feelings, or the ability to reason since all of that comes with learning from everything that is around you. It would just sit there, feed and sleep until the day of his death, therefore he would still go to heaven because again he didn't do anything bad.