Is it possible for a theist and a non-theist to be friends? If yes, how, under what conditions? After all, theism and whatever form of non-theism, are not just opinions, like one may have an opinion about tomato soup or Abba. I think theism and whatever form of non-theism deal with some fundamental ontological and epistemological positions that a person either takes or doesn't take, and these positions are categorically different for theism and non-theism. Given this, a theist and a non-theist have nothing substantial in common - so how could they possibly be friends? Or can someone provide a reason how they could?