Question is: Do we need to. Imho we don't because it suffices to remark that there is no evidence for any gods' existence. There is just no reason to assume the actual existence of a god. Why turn the question upside down? A priori there is no god. Someone proposing its existence should thus be required to justify this hypothesis.
Personal experiences, like reported by catron, are no evidence really. Don't get me wrong, I do believe that his statement is sincere and also that his dad made a strong experience like stated. No doubt about it. But this doesn't mean that any god has to be involved. Experiences get transfigured by our brain with the time. Strongly so. They get mixed with other experiences, expectations, etc. They are diffuse to begin with and mix with what has been transmitted over other ways.
Catron, in no way am I now implying anything regarding your Dad, but I have to name it because it is something one has to take into account.
Dena Schlosser cut her baby's arms off, because God commanded her to do so. There are many other people who justified an atrocity with an commandment by God himself. I do believe that they (at least some of them) actually believed this, but like most Christians I don't think this is true. But how do we distinguish the "supposed" God experiences with the "actual" ones. Malicious -> Not God, beneficial -> God? With what justification? Just because we assume God to be righteous and good we associate all unbeknown experiences with Him? But only because we have this image setup already. If we didn't have an image of the Christian God, if we maybe still did ancestor worship, we'd probably accredit it to our grand-grand-father.
With personal experience more or less ruled out, there is not much left, only gaps in our knowledge about the world that are by some defaultwise filled with godly essence, a very dishonest thing to do.
Framing it this way, the discussion (the general one, not necessarily the one in this thread

