Why is Faith/Belief a Moral Issue?

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So if God naturally instills us with our morality:

1- Why do our parents need to teach us about it?

2- Why do we need to read it from his book?

3- Why does his book disagree with what we are told he has instilled in us?

4- Why are some people sociopaths? God missed them out? You can't borrow Karma from Buddhism, sorry.

5- Why has everyone been instilled with different ideas about morality? Not even Christians can agree.

At best, this all seems to be a metaphor for the way we learn and are born with certain moral traits. If God did this, he screwed it up really badly.