You might believe in the soul, and you must know some things about the brain. Problem is like this. How can someone be accepted by god if the person was incapable of doing good, acknowledge his existence or love him.
Let's say someone has a problem with over secreting adrenaline, or his brain is wired for uncontrollable acts of rage. These are out of his control. Does god forgive him for them?
Or someone with autism. They can't communicate properly (if at all), they can go their whole life not understanding the effects of their actions and cause harm and never know if it means anything.
Or a psychopath. Valid medical condition. Can't love, can't fell remorse. Do what feels right to them is usually egotistical and can be dangerous.
I'm going on the assumption you think everybody gets a chance for heaven. None of the people described above has any fault for their condition. But their actions and thoughts are sinful and can't repent. What happens to them?
And if they do get in automatically because it's not their fault, by what standard? Basically they have been given from birth a free pass. Some are tested and some get the ticket free?