Fine you want a straight answer? I have three.

Athiest answer: The guy who discovered the first vagina, I think we can all agree he made things better for all of us.

Christian answer: Adam

Sklansky answer: A man named Dungoth in Indonesia in 2000 BC pissing in a river which raised the temperature of the already tropically warm water. This newly warm water then evaporated And rose up in a thermal to complete a newly formed cloud which was carried East on an air current. By the time this cloud reached The sierra nevada mountans it was a rainy thunder cloud. There is a place at the foothills of this mountain range which in several thousand years will be known as Sonora California where a Caveman named ehud lived, This Caveman was witness to a thunderstorm from the same cloud Dungoth helped create and saw a bolt of lightning strike an old oak tree which caught fire. He ran close to investigate this new flame which he had never seen and learned about the heat it gave. He learned how it spread and needed fuel to burn. From this day foward he maintained the same flame in his cave that he found on the treebranch of the lightning struck tree. He almost let the flame go out once on a sling hunting trip but managed to add more wood just in time.
As the season changed to winter a cavewoman named Aleahud (who was from the same evolutionary chain, from the same primordial puddle of ooze struck by lightning as Ehud) became very very cold due to the changing season, and wandered in search of shelter.
As she wandered She noticed a pillar of smoke in the distance and her instincts told her to investigate. As she approached she noticed Ehud's cave and drew closer to investigate. As she entered the cave Ehud jumped out from behind a boulder in the cave thinking she was a Bear and clubbed her in the head.
Hours later bound by a rope from braided tree bark she awoke from her unconscious stupor to find Ehud sniffing her crotch. She let out a blood curling scream which startled Ehud driving him to the back of the cave.
Eventually as days past they began to attempt communication and since they were evloved from the same puddle worm species they got along rather well.
It wasn't long before Ehud discovered vagina.
So I can say without a doubt Dungoth is the one Human we could never do without.