Both Cain and Abel came to worship before the Lord, both brought a sacrifice. But there was a difference. Cain brought a sacrifice of the fruit of the ground. It was a bloodless sacrifice in this instance. Abel brought forth a blood sacrifice, and the fat thereof.(The blood sacrafice being a type for the Christ to come.... Was Cains sacrafice dishonering this fact?) Moses’s record makes it easy to understand what the problem was; it specifically denotes the differences between their offerings. But the Hebrew writer makes it even clearer:By faith Abel offered unto God a more excellent sacrifice than Cain, through which he had witness borne to him that he was righteous, God bearing witness in respect of his gifts: and through it he being dead yet speaketh. How did Abel present his sacrifice unto the Lord? It was by faith. Moses did not write that Cain offered his sacrifice by faith,If Cain did not offer his gifts unto God by faith, then how did he worship? The opposite of faith is sight (2 Cor. 5:7), that is, through human intuition. He worshipped according to “sight”—according to what his own senses and wisdom dictated would be an honorable gift unto the Lord.I dont doubt his produce was lovely to look at. No doubt, he labored over those crops until the harvest. No doubt he anticipated that all the hard work, time, and care he had spent on those offerings would be acceptable. This is clearly demonstrated by his reaction to the Lord’s rejection of his sacrifice.Cain’s offering was not rejected because it was not made in earnest in his mind. Instead, his offering was rejected because it was offered according to his own presumption and not by faith.faith is the result of hearing God’s word, submitting the mind and body to its dominion, and acting in accordance to what the Lord has instructed.To whatever extent it could be said that Cain worshipped before the Lord, his activity was negated by the fact that it was not according to faith.By way of contrast, Abel’s offering was by faith. Why is faith attributed to Abel? Paul defines the source of faith that is well-pleasing to God in Romans 10:17.“So then faith comes by hearing, and hearing by the word of God.” Abel offered his sacrifice by faith (Heb. 11:4).Therefore, Abel offered his sacrifice by hearing and obeying the word of God.Cain did not offer his sacrifice by faith. Therefore, he did not worship according to the word of God. And God rejected his offering.Cain was presumptuous. his actions demonstrated that he supposed that he had the right to substitute his own judgment for the Lord’s.The way of Cain is the way of presumption. Those who, in like manner, presume to design their own system of worship are of Cain. Those who, just like Cain, neglect the clear teaching of the Lord and invent for themselves their own their own religious system they are practicing the religion of Cain.