What beliefs would we consider reasonable for a self proclaimed Christian to hold?

[GrandizerII]

But the accident isn't necessarily an example of a supernatural event, and neither are the experiences of NDE necessarily examples of a supernatural event. You still need to provide the evidence that NDEs are due to supernatural phenomena. I've yet to see this evidence that clearly points to such things and is not easily accounted for by naturalistic explanations.

So far there is no proof of either out of body experiences or biogenesis.

You got that right. There is proof for neither out-of-body experiences nor biogenesis (which is the postulation that life only arises from other forms of life). Glad we agree.