You wrote, "If an 'Intelligent Designer' did design us, why do we have so many design defects?" You are either dismissing this "Designer" or criticizing this Designer.
You tell me -- are you saying there is no Designer or are you ridiculing Him? In either case, you are showing your bias, and your ultimate reason for being anti-ID -- the conseqences of "all this" being designed are catastrophic to your world view.
To answer your other rhetorical questions, Scripture is very clear that The Fall ocurred, and the promised consequences have been terrible: death.
But there is a Savior....
ID isn't religious - Try again.
Ah, the ultimate refuge--a "scripture" from a believer tradition. Which 'scripture' did you have in mind?
Everything written 2000 years ago failed to account for atoms and molecules, failed for X-rays and modern medicine, failed to understand sex and reproduction.
The neat thing about science is that it works even when you don't believe it. The planets keep orbiting, thermodynamics keeps on, biochemical processes keep us alive--all whether you believe it or not.
Going to heaven or hell is quite different. There is zero evidence either scientifically or historically, and if you lead your life full of a "terrible fear", the outcome is the same. If a "savior" comforts you, go for it.
Theo: You wrote, "If an 'Intelligent Designer' did design us, why do we have so many design defects?" You are either dismissing this "Designer" or criticizing this Designer.
The recurrent laryngeal nerve disproves the "intelligence" of any hypothetical designer. The so-called "Fall" has no explanatory power here, as the same design is found in all mammals.
It does, of course, have a simple explanation in normal biology.