Catholicisms problem with Cain

I was listening to EWTN radio, Father Trujilo and Ken Brigente on Web of Faith. The caller asked why was Cain's sacrifice rejected while Abel's was accepted. It seems like God is cruel to play favorites.
Well this was particularly good, since they answered that Cain gave the worst of his produce while Abel gave the best of his flock. Both of them, I was told, were shephards and both tended to the plants, but Cain brought the spoiled portions thinking they were just going to be burned, while Abel brought the best of it and dedicated that to God.
What a delightfully Catholic answer. "How may I be right before God by doing, since Cain proves it's possible to do and yet do wrong?" Well sir, Cain didn't do enough work! He didn't offer it the right way, with the right items! More works! More pennance, more humility is in order! Do more, work more, earn more!
Wonderful!

Look what Hebrews 12 says however, "By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh."
And 1 John 3:11-12 says "For this is the message that ye heard from the beginning, that we should love one another. Not as Cain, [who] was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother's righteous."
And if there was any remaining doubt that faith was in view Jude 1:11 testifies that the false teachers who do not believe have gone the way of Cain.

Why did Cain kill Abel? Because he was evil. Why was his sacrifice not accepted? Because he didn't do it by faith. He didn't believe he did anything wrong, or was a broken man. He didn't believe in his fallenness. He didn't believe in the promise of the redeemer, who would come from the seed of the woman. He didn't see a need to sacrifice. That's why he was not accepted.
By faith.

But the Catholic can't live by faith. Because he lives by works. And thus he dies by works, like Cain, who becomes a sympathetic figure.