Then the LORD said to Cain, "Why are you angry? Why is your face downcast? If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must master it." (Genesis 4:6-7)
Cain had some problems. He was the oldest and his younger brother was making him look bad. Abel's offering was pleasing to God. Cain's offering was not. In reality, Abel was not the one making Cain look bad. Cain was making Cain look bad. In fact, Cain was bad because he was offering sacrifices to God out of duty, not love. Hebrews 11:4 tells us that it was Abel's faith that made his sacrifice better; it had nothing to do with what was being sacrificed. Abel's faithfulness exposed Cain's lack of faith to himself.
Do not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own actions were evil and his brother's were righteous. (1 John 3:12)
This is the same reason why the world hates Christians. Because Christians have been made righteous through faith in Christ. The righteousness of Christians exposes the world's evil rejection of Jesus. Our light exposes others' darkness to themselves; and like Cain they can't stand it. It makes them angry. This is why Jesus told his disciples that the world would hate them. This is why the world hates you for openly, and freely, confessing your faith in Jesus. Through him all things were made; without him nothing was made that has been made. In him was life, and that life was the light of men. The light shines in the darkness, but the darkness has not understood it. (John 1:3-4)
Don't get angry when people insult you or belittle you because of your faith in Jesus. Instead, have pity on them. They are on their way to hell! Love them enough to keep telling them about everything Jesus has done for them. Some will listen and be saved. Keep publicly proclaiming Jesus until the day you die. Do not be afraid of what you are about to suffer. I tell you, the devil will put some of you in prison to test you, and you will suffer persecution for ten days. Be faithful, even to the point of death, and I will give you the crown of life. (Revelation 2:10)
God bless
Jason Fredrick