So what would you propose?
Interesting thought. If I were god, I imagine there are tons of things I would do differently, that would impact the reward and punishment system. I suppose before I did anything, I would make it 100% clear to every human on earth that I exist and I am the only real god to have ever existed. I'd stop hiding immediately. By being hidden, I look identical to every single god that humans have invented that are not real. Since I am real, I would make it absolutely clear so its never open for discussion. I would reveal myself directly to every human from the time they are born until the time they die. Then, since they know I exist, they can decide if they want to follow my rules or not.
Second, I wouldn't set up the rules to require human sacrifice as scapegoat system to offer people who are completely uninvolved in the happenings of the bronze aged middle east to be forgiven for the crimes of their ancestors that reportedly took place thousands of years before any of us were born.
Third, I'd remove suffering from children. I wouldn't allow a single innocent child to suffer from solvable issues like food and clean drinking water. I'm throwing this in only because it would be so easy to do and obviously should be done.
Fourth, if I had to have a reward or punishment system, it wouldn't be based on how easily you can be convinced something is true without sufficient evidence. I wouldn't reward people for simply believing, I'd reward them for how they act. I would make it based on how good you were as a person. How much of the time you spent on earth treating people well. Good people get rewarded, bad people don't. I'd never set up a system where bad people (doing the worst things) can get rewarded and good people can get punished.
Next, I would have developed a much better system to explain the rules of human existence and what God actually wants from us, than the bible. This has clearly been an ineffective way to communicate the thoughts of the all-knowing creator of the universe, because even those that are convinced he exists do not agree on how to interpret the text. It's a total failure. If text is my only option, then first off, I would write the entire book and I would make certain everyone knows I wrote it. Maybe a copy would magically appear in the in the hand of every living human instantly, perfectly written in a language they understand. I would include hundreds of statements that make it perfectly clear that the text could only come from a God and not a human, so everyone on the planet would be on a level playing field. (Think unknown scientific facts 4,000 years ago like the germ theory of disease, or how the process of evolution works, tectonic plates causing earthquakes and tsunami's, maybe even a discussion of automobiles, airplanes, and carbon pollution etc.) Whatever method I chose to explain my rules to all humans, I would make certain that everyone has identical information, not open for interpretation, in order to decide if they want to follow me or not. That means no parables. No hidden meanings. No metaphorical stories. Facts only, simplified for all humans. This way all humans would know they are created equal, regardless of gender, color, race, or geography. Especially women. No humans can every be owned as slaves. Rape and murder is never allowed, (you certainly wont have to marry your rapist). Etc.
If I wasn't bound by text, I would make all the rules 100% imbedded in the minds of all humans from an early age. So everyone, no matter when or where they were born, knows exactly what everyone else knows regarding my existence and what the rules are for existing.
Last, if all of this was done correctly, then I would set up a punishment system that fits the crime. No eternal punishment. I would immediately and permanently snuff out those who break the worst rules (murderers and rapists etc.) and give them no chance at all for any sort of eternal bliss with god. I wouldn't wait until they die to punish them, I would remove them from existence right away. Everyone on earth will see what the punishment is for things like murder, rape etc. so only sociopaths or suicidal people would do it. (or maybe I'll just not create any sociopaths, murderers, etc?) For everyone else, rewards would be given to people based on how well they followed the rules with their actions.
Or, better yet, I suppose I'd be happy creating galaxy's and just leave us alone completely and let the process of evolution run its course. It wont be easy, we'll have to come up with our own laws on how to treat people that we think define good and bad actions, then come up with our own punishments for those crimes that we will all agree to follow in each civilization throughout time. Or is that the world we already live in?