"For example, the perception of the bony structures in the whales anatomy that give his flippers strength and rigidity as 'feet'"
Look at the feet on the back end of the whale. Those ARE clearly feet.
If we were "intelligently designed" then:
Why do we have a pancreas?
Why do we have an appendix?
Why does the Octopus have a far superior eye?
Why do we have wisdom teeth?
Our design is remarkably inefficient. If I were to design a something, why would I add useless parts? Why are we designed so badly?
"The use of the word 'synthetic' should always have a caveat added and that word is 'yet' Just because nylon and other 'man-made' products have not been seen in nature does not mean they are not already there at places we have not detected or in forms we have not detected or in compounds that are similar but better 'designed' LOL."
So now you won't even accept that nylon wasn't around before 1935? You need to take basic chemistry.
By your reasoning humans should be able to digest hydrochloric acid. (we don't have a problem with hydrogen in water!)
"If I were to design a something, why would I add useless parts? Why are we designed so badly?"
I'm not sure how some "Creation-God" believers would answer this, I can only speak for myself. But are you aware that in Christian theology, the physical world is not regarded as being in a state of perfection, but rather existing in a state of significant corruption and degradation? This concept is very rudimentary Christian theology and long pre-dates Darwin and is not, therefore some anti-Darwinian "dodge."
We don't know why we have an appendix, it's very possible that at one time it provided some purpose or enhancement. It's demise and apparent vestigal condition says absolutely nothing about original intent or design.
Historic Christian theology explicitly endorses the idea of loss of function in the biological world. It presents no impediment to Christian belief, indeed, its evidences substantiate, or at least harmonize with Christian theology. --and this is a very ancient view.