Not being a religious person I'm seriously thinking of becoming a convert having read this passage from Genesis 4:4
Cain and Abel
So it came about in the course of time that Cain brought an offering to the LORD of the fruit of the ground. Abel, on his part also brought of the firstlings of his flock and of their fat portions. And the LORD had regard for Abel and for his offering; but for Cain and for his offering He had no regard. So Cain became very angry and his countenance fell.…
http://biblehub.com/genesis/4-4.htm