" I find the most compelling view is that it originated elsewhere..."
That's fair enough -- and indeed allows an extra few billion years or so for life to emerged and come to Earth. The main problem is that this doesn't really answer the question of how life began in the first place. Here, or elsewhere, it makes little difference if there doesn't exist the mechanism required to drive the emergence of life by natural means. Still, it's worth exploring as perhaps the conditions elsewhere are more suitable for life to start up. And indeed if life came from space then it would follow that we are probably not alone in the Universe, which would be a huge discovery.
But life coming from beyond our planet isn't the same thing at all as intelligent design.
What does appears to be the case in favour of abiogenesis is that the time between Earth being "ready" for life, and life emerging, is perhaps very short indeed. A recent study (
http://news.sciencemag.org/biology/2015/10/scientists-may-have-found-earliest-evidence-life-earth ) may have pushed back the earliest origins of life to almost as soon as things settled down. Remarkable if true -- although I should point out that the study cited above isn't yet confirmed as being a sign of life, and it is more likely that it's an open question as to when, and how, life actually began.