I've said earlier on in a different thread that just because things might seem to appear designed because of how our brains work (we tend to see order, patterns, purpose etc), it could still be that they look designed because they are. The idea of a supernatural Creator being unrealistic or improbable, is deduced by the same reasonings that are used to deny design. I think our reasoning abilities are limited and we can tie our selves up in all kinds of arguments, fallacies, mathematical probabilites etc. I think science will discover more about the origins of life and we may see more answers in our life-time hopefully.
"The eternal mystery of the world is its comprehensibility"
Albert Einstein
Albert Einstein