What beliefs would we consider reasonable for a self proclaimed Christian to hold?

[GrandizerII]

Your hypothesis of self creation does not conform to reasonable logic.

He didn't argue that things create themselves. The argument is that chemistry is a thing ... that happens ... naturally, without the need for divine intervention.

The complexity of DNA is absolute proof of ID over happenstance.

There's no absolute proof here (in a world of large numbers, even what is deemed improbable is possible), and nobody is arguing for spontaneous generation (which is what it seems that you mean when you say "happenstance"). So quit repeating the same old same old, and listen to what we're actually saying. You might end up learning something for a change.