We could have a fruitful discussion on this topic, but only if we define
the question carefully.
Help us to understand what you see as the fundamental question and the
spectrum of possible answers.
One question that you posed is: "Where did the complexity [of the earliest
known fossilized metazoans] come from?"
To this question you seem to be offering only two radically different
answers:
1. They were "created," by which I presume you mean that their specific
form was imposed on matter by an extraordinary act of the Creator, an act
that was necessary because the simpler materials of the Creation were not
capable of bringing about a formational history with these metazoans as the
outcome.
Is this what you meant by "created"?
2. "...it came from nothing..." This is, of course, a very vague clause. I
presume that you have some form of naturalistic/materialistic worldview in
mind here, but could you be more specific?
Finally, are these the only two alternatives available to us -- either (1)
"Episodic" creationist theism (or "special," or "fiat," or whatever term
you prefer), or (2) evolutionary naturalism?
Howard Van Till