Yep, I know. I'm an Atheist so I don't believe in Satan or any other spirits, evil, benign or supremely indifferent - but YOU do.
So, how can you tell that your god either wrote the Bible or inspired its authors and not Satan, the Great Deceiver?
One problem you have is that you claim that morality, and especially our knowledge of right and wrong, was revealed to us by your god in the Bible or by communication through various prophets and saints as recorded in the Bible. So you have no external references by which to judge the morality of the Bible.
So, what if Satan wrote the Bible to mislead you? What if your god has given us science so we can discover the lies Satan wrote in the Bible?
I could now give a long list of supporting evidence for that view with examples of the god of the Bible telling us to do plainly immoral things, but I don't believe it myself, since I don't believe in Satan, as you do, so I'll spare you that list. You can probably find examples for yourself in Exodus, Leviticus, Deuteronomy, the various epistles of Paul, etc.
BTW, have you ever read Leviticus 26:16-46? Doesn't it strike you as written by someone who got just a tad carried away at the thought of making people suffer in unspeakably nasty ways? I could almost still see the flecks of spittle...
Over to you. Just a simple proof that Satan couldn't have written the Bible, please. Obviously, you can't quote the Bible as evidence because Satan could have included that to fool you. And you can't use any external reference points to judge right and wrong because there aren't any.... are there?
If you can't prove that Satan didn't write the Bible, then how do you know you aren't condemning your children, and anyone else whom you persuade that the Bible is your god's word, to an eternity in Hell?
Don't you have a moral obligation to be sure? Or is your need to persuade others to agree with you more important to you than the consequences that might have for the other person? Are you saving souls or just boosting your own ego?
BTW, if you don't agree that we get our knowledge of right and wrong from your god via the Bible, then I'm fine with that. You are confirming that we need neither your god nor the Bible to lead a good and moral life. You are confirming in fact, that Christianity has nothing to offer us.