Adam is the first human created by God. He is the husband of Eve, the father of Cain and Abel, and is the progenitor of humanity.
History
Adam was created alongside his first wife Lilith in the Garden of Eden. However they separated and God used one of Adam’s ribs to create his new mate Eve. Throughout their millennia of marriage, Adam still longed for Lilith and never really loved Eve, who tried to change herself into the woman Adam wanted her to be but was never enough for him.
Eve did sire him two sons named Cain and Abel. When Eve and Adam died on earth they became the first human residents of the Silver City.
During Lucifer
According to Eve, Adam lounges around Heaven for the most part. Even Lucifer sarcastically calls him "a barrel of laughs". Since Heaven got ESPN, Adam has been watching avidly.