The Bible teaches that when Adam and Eve disobeyed God by eating fruit from the tree that was forbidden, (commanded) not to eat, that they would die. It also meant that in addition to dying it also caused a sin nature to be passed on to all mankind. They did both die spiritually at that moment and they became aware of sin for the very first time.
I confess that the thought has passed through my mind (and maybe yours?) that “gee that punishment seems kind of too severe for one “little” transgression.
But I have come to believe that I now understand the folly of that thinking, and it is this:
The consequence of Adam and Eve’s disobedience only seems severe because by thinking with our little pea brains (compared to God’s brain), we have no way to comprehend or understand the ALMIGHTY VASTNESS OF THE HOLINESS of God. He is SO holy that the tiniest disobedience is a massively deadly transgression!
God was not being unreasonable or unfair.
So YES, God was fair.
He was also the epitome of love.
He sacrificed His only begotten Son, Jesus Christ, so that all who would accept Him and follow Him would have their sins atoned for, enabling them to see, enter, and enjoy the Kingdom of God:
But when the fullness of time had come, God sent forth His Son, made of a woman, made under the law to redeem them that were under the law, that we might receive the adoption of sons.