We know that evil is associated with several deaths and we know Satan is present leading up to the crucifixion.
Is this evil associated with the deaths of:
- Everyone on Earth except Noah, Mrs Noah, Ham, Spam, Jaffa-cake and their wives?
- The occupants of Sodom and Gomorrah?
- Onan?
- The firstborn children in Egypt who didn't have the right picture hung up in the hall?
- Aaron's son for "the wrong kind of fire"?
- That guy picking sticks up on a Saturday?
- The couple of thousand people who complained about the killings?
- The citizens of Jericho?
The list goes on. Deaths attributable to Satan - 10. Job's three daughters and seven sons... and who sent him to do it?
'We' don't know anything of the sort about evil. Evil is a word we put against activities that we see as antithetical to the underlying social mores with which we were raised (much as how I'm railing against these deaths portrayed in the Bible) - evil is not an independent force, or some manifestation that 'infects' people, it's a characterisation of people's choices and actions. That's why Satan needs to be redeemed, because the entire point of Satan - or, at least, the serpent, which is typically considered to be Satan - is that Satan gives the power to humanity, he makes humanity responsible for their own choices in a garden where God tries to keep them ignorant/innocent and under control.
I don’t think Satan is portrayed in the bible as God's arch nemesis but the preternatural enemy of man
Well it would be pointless to try to come up with a Nemesis for an all-powerful, all-knowing deity, look at the trouble they have coming up with Superman villains. He is portrayed as the enemy of mankind, yes, but the point is that this characterisation doesn't really stand up to scrutiny very well. Satan sets humanity free of its shackles, if you choose to look at it from his point of view, having thrown off his own constraints before.
That I’m afraid is down to a categorical error on your part.
Given the absolute lack of any validating evidence for either of them, how can there be categorical errors in the absence of categories?
O.