cofty: Most creationist arguments can be summarised as "complexity, complexity, complexity - therefore god"
I think that all theistic arguments come down to 'god is necessary.' In other words, god has to exist. They presuppose god and then demand that this claim be disproven. "If there is no god, then how do you explain [this]?" "If god doesn't exist, then how can [this] possibly exist/work?" "Without god, how do we account for [this]?"
I wanted to demonstrate god for those who did not believe, because it seemed to me that there had to be an ironclad argument that couldn't be refuted or denied. This was god we were talking about, after all. But without the presupposition, there is no angle. No starting point. And if you just assume god --if that's all that you have-- then how can you know who/what it is? There is no approach to demonstrating god that cannot be used by anyone to support any religion. And we see them all use it. Their book is infallible, other books are not. They have miracles they can point to. They have testimonials. They have prophecy. Everyone else is lying or deceived or just wrong.
Think about it. Think about any approach that apologists use, and you'll find that they come down to the necessity of god. Complexity, as you point out, is perhaps the most popular approach. But there are others, and they mostly rely on gaps in our knowledge or understanding of the world/universe. Discard the presupposition and start from a blank square, and you won't get to god.