At what age do you think God would do this?
Certainly at 2 years old, or even 4 years old a child even when told they are sinning doesn't understand the concept of sin. I think I was around 7 years old when I could understand that I was sinning and that was bad, but I still didn't understand why that was bad. I knew of God, but couldn't make the connection.
It was around 9 that the connection was made, but still doesn't know that I needed a Savior. That didn't happen till I was 34 years old when I gave my life to Christ.
So, I do not think that a child who cannot understand that they have need of a Savior will not end up I he'll. Yes, w have a just and holy God, but he is also loving and merciful too.