outhouse
Atheistically
But what is to stop someone from arguing about the necessity of a god- a philosophical question, without discussing the dogma of a god- a religious question?
Not really the OP is it?
But I hope, and I think you do know, that this concept of god meant different things to every civilization that has existed. The necessity is more of a historical question not as much a philosophical question.
Basically the philosophical aspects are blind without the historical concept. Even if we were talking about todays views one needs biblical knowledge to discuss the topic in detail, because so many people define it "properly" in their perspective.
And if you don't understand "their" personal perspective by having that knowledge on tap, your lost in a debate and you have no ammunition.
I guarantee you both have different ideas on this definition, and if you spend all your debating differences, you never get to the content in context that is relevant.