Abel (Abel means 'vanity') he was a keeper of sheep. A keeper of sheep is called a shepherd. Ever since Jesus called himself the 'good shepherd', pastors have likewise been referring to themselves as shepherds and their flock as being the congregation.
Joh:10:14: I am the good shepherd, and know my sheep, and am known of mine.
So from this insight we learn that Abel (vanity) was not a man but was a doctrine (a congregation) born from the Mother religion Eve (Foundation of Life). If this is so then what is Cain?
The text says that Cain (Cain means ‘Possessions’) was a tiller of the ground. Remembering that the ground is God's field (mankind) we can assume that a ‘tiller’ of mankind must be some form of worldly business based doctrine or theory. This would tie in nicely with his name meaning “possessions” a business could have worldly possessions.
Both Cain (Possessions) and Abel (Vanity) are doctrines because they were both born from the mother religion, Eve. They were called sons because Eve knew the dark truth that there are no such things as gods. Cain (Possessions) is even worldlier than Abel (Vanity) because he was a 'Tiller of the ground-(mankind)'. God is Truth and a worldly doctrine born of atheistic truth can be likened to a scientific attitude (the theory of evolution would be a good example of this belief). Seeking knowledge is good but people also need to appreciate their spirituality, consciousness and moral obligations. Science has no morals and promotes atheism which denies a person’s right to spiritual comforting. Religion gives us morals as well as a comforter.
In today’s terms, Cain (evolution theory) and Abel (creation theory) are still with us, struggling one against the other to win favour over the minds of the population. Cain slew Abel; how? The Bible said they talked! Cain slew Abel with words.
Ge:4:8: And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.