here and here. I pose several questions, one being how can Axor differentiate between evidence for an Incarnation and evidence for belief in an Incarnation.
SM Stirling's Father Ignatius can compare only human traditions but these differ at least as much as any imagined alien world views. Ignatius thinks that the Buddha and Plato were holy men but without "'...the fullness of the Divine Logos to guide them!'" (The Sword Of The Lady, Chapter Sixteen, p. 487)
Why did they not have the fullness? The Logos/reality/source of enlightenment is within everyone. The Word is the light that enlightens everyone (see here) and the Buddha is the Enlightened One. I find his spiritual teaching more helpful than anyone else's.