Share 'Why do theists think it's arrogant to believe there isn't a God?'

During a discussion a theist friend of mine suggested that 'atheism is just so arrogant', and I was wondering what may have led them to this judgement. I do indeed have my own theories of why a theist may think this, and believe that the no God view is a modest standpoint. However, I'd like to hear any theories or experiences anyone else has on the matter, and I ask not just in principle but beca…