So hang on now. Who is to blame! Man? Or a fallen angel? You said a fallen angel is at fault for deceiving Eve... And then you say god sent Jesus to pay our penalty? How is it our penalty if it was the fault of a fallen angel?
You make no sense whatsoever
Lucifer was an angel in heaven with high position became prideful and wanted to be equal to or set himself above God. There was war in heaven and Michael cast out Satan and 1/3 of the angels of heaven. Satan ended up in the tree of knowledge of good and evil after entering the serpent and deceived Eve on this earth. Lucifer/Satan fell first originating sin in heaven was kicked out - Adam was given the earth to take care of and rule over and placed in a perfect world but originated sin on earth Eve through deception, Adam by choice.
Angels and humans are different, man was created a little lower than the angels and in God's image, angels have always been messengers and servants of God to do God's will.
Lucifer/Satan was at fault for the corruption in heaven. Adam and Eve had a choice and could have said no but didn't so it is man's fault for sin on earth. The wages of sin is death and there will come a time when all evil will be destroyed Satan the originator along with all the ones who don't accept the plan of salvation to save man.
God could have destroyed Satan right away, but there was doubt amongst the angels and they would have served Him out of fear and not love. So that is why God did not destroy Satan right away because God gives angels and men a power of choice and God won't mess with our choices as He wants us to choose to love Him.