In my worldview, which recommends putting the emphasis on Original Blessing, that blessing is NOT the promise of eternal life. The blessing involved an actual change in the neural circuitry of the Homo sapiens brains that enabled them to invent symbolic language and to exchange abstract thoughts with their compatriots. As a result of the freedom that God granted in the use of this Gift, (that is , a Conscience that could be followed or ignored.) morality appeared for the first time on earth. It may well be impossible to locate a genetic mutation(s) that could account for this gift, but its rapid spread thru our species might be due to the known epigenetic changes that occur in the teaching/learning process.
At any rate it makes good sense (to me at least) to date the origin of humankind on this earth to the first time a Homo sapiens could use (or mis-use) Conscience to strive to become an Image of God–a condition that other animals can never achieve. This may well confer eternal life to our spiritual nature, but it makes no sense to desire eternal life for our biological bodies.