Religion can be about creating a conceptual space in which you ponder that which is beyond the human, or the extraordinary nature of being. I'm not sure that's at all poisonous.
originalbigmavis is, I think, correct.
I think your sweeping statement about religion seeks to absolve humans of their agency (and their flaws) and also evades any real depth of thinking about why humans do all this killing - or even all this ideologising.