My amateurish reading of popular science books tells me that it is generally

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My amateurish reading of popular science books tells me that it is generally thought that all life descended from one original single-celled creature. Perhaps if the conditions of the world were better ‘tuned’ for life, then I suppose life might have originated from 27 different ancestors, or from 97,583 different ancestors, or from 94,523,987 different ancestors. Perhaps if the conditions were less well ‘tuned’ for life, then life would not have arisen at all. The number one seems a rather unique number. Does the fact that all the life which exists in all the known universe seems to have arisen from one ancestor indicate the involvement of a designer (God), because of the uniqueness of the number one? Presumably if all life originated from exactly 1,000,000 ancestors, then we would smell something fishy, because of the uniqueness of this number. Similarly does the uniqueness of the number one point towards a non-naturalistic account of the origin of life? Thanks.

Although it is, as you say, "generally thought that all life descended from one original single-celled [organism]," the issue doesn't seem settled among the experts, as reported here.

But regardless of the resolution of that issue, I'd answer no to your question. Each of the numbers you mentioned is unique. Any card in an ordinary deck is as unlikely to be drawn as any other; it's just that we arbitrarily assign special significance to particular cards, such as the ace of spades. Similarly, we may assign special significance to the number 1 or (simply because we use a base-10 system) the number 1 million, despite the fact that every number is unique. Furthermore, it's not clearly true that "all the life which exists in all the known universe seems to have arisen from one ancestor." More accurately, it's "all the life we know of seems to have arisen from one ancestor." The life we know of may constitute a small sample of all the life that exists, as yet unknown to us, in the known universe: almost all of the known universe isn't well known by us!

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