And this is also what he takes Christian doctrine, in all its complexity, to be centrally about, that is, teaching an attitude rather than a set of propositions. Call it joyous openness to life. What's not relevant about that?

When I'm on the operating table, I'm happy for the surgeon to treat me as a machine, but the moment I return to consciousness I have other needs and aspirations that should be recognized. We're not here only to survive or extend our individual or species life but to do something seemingly more difficult, for which I've used words and phrases like 'love' and the 'Kingdom of God'.

But why should a religious person be interested in a work like Heidegger's that many regard as the epitome of nihilism? For a start, because Heidegger forces us in a way that few philosophers do to really think through the seriousness and all-encompassing nature of our mortality.

Perhaps unsurprisingly, there's a paradox here! Kierkegaard's own indirect communication proposes that we start with the experience of those who don't believe and meet them on their own ground. His success in doing this is evidenced by the fact that, at least for some periods of the 20th century, aspects of his work became a major focus for radical thinkers of various kinds, including the non-religious and, interestingly, a significant number of Jewish thinkers (Buber, Rosenzweig, Taubes, and others).

What it does remind us is that 'God' is not to be separated from the quest for the Kingdom of God and is not and cannot be the object of any detached 'scientific' contemplation. Heidegger's critique of onto-theology is also driving a wedge between speaking of God and the aims of science - not so as to get rid of God but rather to free God from a false objectification.

In brief, I regard love as a more decisive focus of meaning than death. In terms of Heidegger's argument, this is because I think he misdescribes the importance of the deaths of others and focuses exclusively on my relation to my own death. But, in reality, the deaths of others have a more urgent and immediate impact on our lives than the purely notional knowledge that I too will one day die.

It seems that just Being, the sheer fact of existence, that there is something rather than nothing, already inspires a wonder akin to religion. But - as in my comment about the Kingdom of God in the last answer - Jewish and Christian traditions are also prepared to challenge what 'is' for the sake of what could be.