Good human beings are made, not born. Because we are all born on an equal footing. And after that it is our spiritual quest, & yearning, which will determine whether we rise or fall in our humanity.
One of the pre-conditions to be a good human being is to believe in the law of karma, which basically states that good will be rewarded with good, & vice-versa. Once your belief in this is unshakeable, you have laid the foundation of your good humanity as it will motivate you towards goodness, & virtue.
There are some doubters who say God is unjust & there is no justice in this world. These people often find it difficult to practice to be a good human being as they believe they can get away with doing bad.
You have to believe in God’s justice to be a good human being !