Speedwell, I am going to approach your response sections in reverse because the first section (two whole paragraphs) requires many comments.
So yes this thread IS about design consciously imposed, i.e., by an intelligent source. My last comment was only provided to provide other collateral evidence for such a being’s existence (you should see what many modern physicists are beginning to conclude...one group is saying they the evidence implies “consciousness” (an awareness or intelligence) as the source for ALL material existence, the other is that a “consciousness” is inherent in our concept of and perception of material existence, and it itself cannot be explained by material means).
Why? Because having concluded (in their opinion only) that nothing exists “outside of or beyond the materiality” (their definition of “the natural order”), to admit, suggest, or allow for the existence of God/gods/or higher order intelligent forces, destroys their explanations tending toward an abiogenesis or life and humanity evolving by natural means only.
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Functional complexity in itself is not evidence of design.
I agree!
Design is not directly detectable in an object.
I agree if we were speaking of a simple static object but living things are not simple static objects but functionally interactive systems comprised of functionally purposed forms and forces all of which must work in harmony to maintain optimal existence. Remove essential component forms, functions or forces and “life” ceases and it dies and disintegrates.
If I'm out camping and pick up a rock to pound in my tent stakes, I have "designed" a hammer. After I move on, you would be hard-pressed to find out which rock I had used.
True as to which rock, however, based on the presence of the tent (even if now in disarray) with pounded in tent stakes (the final product of a process) we would KNOW an intelligence was involved.
Even if I shape the rock for the purpose by banging it against another rock you might have a hard time picking it out--ask any paleontologist who is trying to find stone tools in a rockpile. In fact, what he is looking for are traces of human manufacture from which he may infer human design, and when he finds them he may still not be sure of the purpose of the object, what is was designed for.
Now apply this truth to the presence of living forms (cells, and cell based organisms) and you SHOULD get it.
Considering the watch of your example, I would infer a human designer not because of its functionality or its complexity but because it was obviously a product of human manufacture--with tool marks, refined materials, etc. If I could not conclude that the object was of human manufacture, then I could draw no inference one way or another about the existence of a designer.”
You do know what an analogy is right (no insult intended)?
In a watch we have a system of forms and functions that must work together is a very specific way and so are made to be in relation to one another is such a way that in the end it keeps time by causing the movements of all interactive parts to function as a unified whole. The source of its power is an intelligently designed outside energy applied to a winding mechanism (a force) or is supplied by an intelligently designed battery which then is intentionally inserted in a mechanism intelligently designed to draw out and apply its potential energy.
A living system is NOT mechanical but in some instances acts in a similar fashion
For one example see
A Rotary Motor Drives Bacterial Motion - Biochemistry - NCBI Bookshelf
that being said, whether we are talking a mere cell OR a higher order organism composed of billions of cells, we are speaking of a system of precisely interactive forms, functions and forces that also are inter-dependent on each other to function and perform as one unified whole. The source of its power is called “life” and each level of these contains awareness (consciousness) which is non-material in nature.
So again,
IF one looking at a mere watch or any mechanical device (so much more primitive and less than)
demands a creator as the explanation for it,
THEN a more highly organized unified system (mechanical or otherwise), a million times more complex in its precisely purposeful forms, functions, and forces (so highly interdependent and interactive), logically also implies a creator/designer.