Why, on your account, must it be unpredictable/irrational/random without a creator?
It need not necessarily be irrational without a creator If the theory predicts neither a rational nor irrational universe, you are left with only the assertion that we have a rational universe purely by coincidence (and absolutely no confidence that this rationality is anything more than illusory). Effectively, having been asked why an incredibly unlikely event came about, you have responded "why not?". It's a non-answer, try again.
An integrated circuit etc, sure, because we know how to build those, how they work, how they were developed and have been improved etc.
If you're talking about biology, then we also have some understanding of how the "circuit" started, how it works, how it has changed over time. That understanding doesn't involve a person (even a person of dubious, immaterial existence such as your "Creator") :-)
This appears to be falling back on neo-darwinian evolution as a logical axiom. Unfortunately the neo-darwinian hypothesis of evolution by natural selection of traits arising from random mutation CANNOT account for biology as we observe it. I refer you to the overwhelming body of evidence.
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. Yes I'm a fan of CMI's website :)
As a person is our only seriously tenable explanation for the existence of an integrated circuit, so an intelligent agent well beyond humans is our only seriously tenable explanation for the existence of even a single cell.
So, this statement,
we also have some understanding of how the "circuit" started, how it works, how it has changed over time
is proved invalid by denying one of its axioms. Unless of course, you can prove me wrong and build a cell personally. Then I'd have something to think about. I'll recant my whole setup if you can get a cell to arise from non-living components without human intervention. And pay you every cent in my bank account :)
So again, what is your reasoning process for predicting a rational universe from a non-rational, non-intelligent, impersonal, naturalistic beginning?
You'd have a long and difficult (perhaps impossible) road if you're arguing for Theism/an interventionist deity. :-)
Agreed, but lets not get ahead of ourselves ;)