Lucifer was created good, as all God created was made good! Like humans, the angels are rational creatures endowed with free will. Lucifer and the rest of his demons fell just as humans fell from God's grace due to pride and arrogance.
But why are we concerned with Satan in this case? My point was that every time humans reject God they commit evil.
Does Lucifer have the power to thwart God and cause Him to change His mind and alter His plans for creation?
"But why are we concerned with Satan in this case? My point was that every time humans reject God they commit evil"
I believe you said "Humans are authors of evil". The author of evil, if you can say that, was Lucifer/Satan. He was the tempter who caused Adam and Eve to sin and brought ruin to mankind. After the fall mankind could only sin until the Redeemer came.