Why is satan supposed to be so bad? What did he actually do? He gets the blame, sure, but what does he explicitly do? Can’t explain why you did something bad? Blame the devil. An excuse.
He tempted Adam & Eve by telling them the truth! If they ate from the tree they would be the equal of god. Is this true? They ate from the tree. God got pissed and threw them out. (Now, did they possess the same knowledge, attributes, etc. that god had? I don’t know that part, it’s all about them getting tossed from the garden. But I digress.)
If they did have all god’s attributes, why could he so handily bounce them from the garden? Why didn’t they fight back? There were two of them. In any case, god said if and when they ate from the tree they would die. But they lived another 900 or so years. So who lied? Not satan...
And the bit about tempting jesus. So what? He tempted him, jesus declined the offer, no-harm-no foul as far as I can see. What does satan actually do that makes him so bad?
Tell folks to slaughter women and children (but keeping the more attractive women for wives)? Destroy whole towns or civilizations? Kill 70,000 people because some guy took a census and a myriad of other nasty things? No, it was god (the one who supposedly loves everyone) doing this! Not satan...
God does all the reprehensible things but satan gets blamed for stuff only because he seems to be a handy scape goat the way I see it. Gotta have someone or somewhere to place blame. It seems satan is just a convenient excuse for taking responsibility oneself. And just for trying to make people more aware that the being they worship is an egomaniacal, self-focused, jealous, petty, vicious, capricious, mysoginistic, racist who insists that you base your whole life, without question, on his rules exclusively or he’ll kill you. Some choice. One lies yet says it is impossible for him to do so and one doesn’t lie but is called the "Father of the Lie." Say what?