I would look into hans jonas' text "the phenomenon of life,  the essay  "heidegger and theology."  he was a student of heidegger among other... Also, see Jean Luc Marion's collection of essays "the visible and the revealed," and Michel Henry's  text " I am the way." also Derrida and VAttimo "on religion," and maybe even Agamben has something on this matter in "Potentialities" or "the time that remains."
best wishes...