Which brings up a very valid point. We decided shortly after our son's first birthday that God should provide robotic children before real ones. That way we could make those monumental first mistakes with that unfortunate first child without having to face the ramifications. Once the robotic child reaches puberty you could just unplug him or remove his battery. Then of course, you can't omit the sin factor.
Parents are humans and, as such, are born with a sin nature.
Even Christian parents sin often. Some with every chime of the clock. There's a saying that every time a bell rings an angel gets its wings. I'm more inclined to believe that every time a bell rings a parent commits a sin. That's much more believable to me.