Salvation is all about Jesus and what he did. Yet man in his pride wants it to be all about himself. This is nothing new, in fact it goes all the way back to the children of Adam and Eve.
Genesis 4:3-5 And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the LORD.
(4) And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering:
(5) But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.
Abel brought an animal sacrifice, picturing Christ. Abel was obeying God and offering the sacrifice he was commanded, but Cain brought his fruits...the fruit that he worked so hard to produce . This is an excellent picture for us of those that believe in simple faith in Christ to save them (Abel) and those who want their works to save them (Cain).
Just like Cain, people who are trusting works get very angry when you suggest that all the works they have done for God are not involved with salvation. Cain got so angry he ended up killing his brother. You see this repeated all throughout history. The Jews, specifically the Pharisees, killed Jesus. (1 Thes. 2:15) They then continued to persecute the Apostles. The Roman Catholic church, which teaches you are saved by sacraments and deeds, killed many Christians who believed in faith alone for salvation as "heretics".
But it's not about us! God will not share his glory with anyone. You are either saved by Jesus, or else you will go to hell and pay for your own sins. If you trust in works in any way, God will judge you by your works and you will not be able to stand on judgment day. ONE SIN will send you to hell.