“The biosphere certainly, in all naturalistic accounts of the origin of currently extant life-forms, most assuredly preexists life as we know it.”
Huh? A biosphere is a collection of ecosystems, and you can’t have an ecosystem without living organisms. Without living organisms, the ecosystem is reduced to simply an environment, like we have on Mars, or Venus.
“...the question of the origin of a large complex dynamical system which functions as an intelligent agent (the biosphere) is not addressed by evolutionary biology and is not satisfactorily answered by naturalistic account”
Yes, we can agree on that, but that’s not the extent of the problem, as I see it. If you concede that a designer is required for the diversification of life once it exists, then you have essentially conceded that a designer is required for the origin of life. Otherwise, whence come the essential elements of life, which are just as complex as the diverse forms they supposedly evolve into?
Darwinists avoid that question by positing blind, unintelligent forces can produce complexity, but if you concede the need for a designer to produce complexity then you must be consistent and explain how the original complexity appeared without a designer, or you have an incomplete theory.
If you will focus your minds on the following, all such problems are resolved: the Universe is designed by its Creator to produce complexity.
Therefore, no complexity we see is accidental, random or unintended.