Just my two cents without having read all posts in detail:
1) As others commented, the chicken-egg 'problem' isn't solved by pushing the origin of life back in time by assuming design/creator, whether that be a divine entity, or just extraterrestrial life forms (even in it's simplest form). Somehow life started when no life existed before, or life always existed (although that seems implausible to me).
2) The fact that we currently don't have a full understanding of how life began, doesn't invalidate what we do know further down the chain.
When we find a dead John Doe with bullet wounds, and a gun which ballistics characterics match it to to bullets in the victim, we're quite sure what killed the guy. Even when we don't know who pulled the trigger, or why the victim is in a closed vault.
Still, I'm very interested in abiogenesis. And I love the research that Craig Venter does re artificial DNA.