Why do christains dislike satAn so much . Issent he who keeps the churches I'm business ???

I mean think about it . Doessent every religion need the bad guy ? On movies do to we need the bad guys ? Without them there's be no point in going to church ... There's no bad guy to place Blaime on . Instead of placing blame on him we'd have to take responsibility for our own actions .. There's be no point I'm going to church because we blame everything on satan , depression , violence ect . So without him people would have no need to go to church .. So I think we owe thanks to satan he's actually the one keeping the church on business if u think about it