My understanding about the idea of intelligent design is that, unlike creationism, it's a way to relate observed facts to the existence of a creator.
The thinking goes "Gosh. Isn't the world complicated? Surely something this complicated and elegant must have been designed by someone, and couldn't just have come about by accident?"
Often the eyeball is held up as an example of intelligent design - it has evolved independently in higher molluscs (the cephalopods) and most vertebrates, ending up with almost exactly the same structure - a clear, tough front; an adjustable lens with some sort of light-limiting iris; and a light-sensitive membrane at the back composed of a mosaic of light-senstive cells. One would expect that a single designer would come up with a single design to do the same thing (see) in many different organisms.
Unfortunately for intelligent design, you would also expect a blind, non-sentient molecular process to stumble across an idea that works and then stick with it, rather than reinvent it, at least within a single line of descent. So even if ID held true, it doesn't necessarily mean there has to be a creator.
And while eyeballs might be a good example, locomotion isn't. Think of the different ways animals walk or run - birds on two legs; insects six; crustaceans ten; molluscs anything from one (snails, bivalves) to twenty-plus legs (some squid); arachnids eight; mammals & reptiles four (except when it's two). Some can't walk backwards, some have to go sideways, and elephants have four knees. Any designer who wasn't randomly whimsical (which by most standards would be a sign of lack of
applied intelligence) wouldn't have bother coming up with so many different ways to do the same thing.
So, as a theory, intelligent design doesn't really hold up at all.
Having said that, there is no contradiction whatever between intelligent design as a philosophical concept and the empirically-based idea of evolution. One is about intent, and the other is about method. (There isn't even anything in evolution that precludes Christianity, if you accept that some of the Bible is aetiology and not concrete fact, as most of Christianity has managed to do.)
Evolution does more or less hold up. It has flaws and weaknesses, but it explains more things more simply
and with more empirical evidence than anything else we know about.
And the stupidest thing about the way the whole idea of evolution (and modern cosmology, chemistry, physics, etc,, for that matter) is perceived in some parts of the public imagination is that it couldn't have been an interesting and entirely posible for an omniscient and omnipotent God to have use evolution to do exactly what He (or She) set out to do.
And that Moses and/or Aaron (who the devout believe first wrote down the creation accounts of Genesis) didn't have God telling them about how he'd "come up with this really neat idea of using a double-helical molecule to transmit genetic information from one generation to the next, because, it introduced a pleasing randomness, and - more than anything else - omnisicience is actually so
boring unless there is an element of randomness built in. One knows all of the
possible outcomes and their relative likelihoods, but the fun comes from random occasions when something happens to surprise One.
And, by making space-time relative and even flexible, and allowing the effects of gravitation to slow down the rate of Earth's spin so days became measurably longer over time, One thought One had left enough of a hint that in the future, intelligent people would realise that some things you write down or read today are limited by your own personal understanding of it today.
Is it so hard for you to see that in revealing My truth, One can choose which parts One thinks the listener will understand, but even in the act of remembering and writing down, the person to whom the truth is revealed will have errors of memory and understanding? Assuming you write it down straight away, that is. Trying to describe a process you don't yourself understand to a third party and expect them to understand it is as futile as expecting you to see the Truth without attention-catching gimmicks like burning bushes, raining frogs, and the like.
If you really understood you'd know this is the real reason One keeps telling you that One passeth all understanding - you aren't too stupid, you're attention span is too...
... Moses, your eyes are glazing over. Honestly, if One didn't know better, One would say you wouldn't recognise the Truth if it were nailed to a piece of wood in front of you. Maybe someday that will become necessary.
Well, anyway, it became possible to create the whole universe in six sets of activity and still call each one "a day" with a straight face, even though there was a high probability that some overly literal-minded fools would get hung up on one particular English translation written by one man who only had access to translated copies of copies of the originals, about 1600 years after... Moses?
MOSES! Are you writing this down? Honestly, boy, your heart is in the right place, but with the likes of you around I wonder what will happen when people become smart enough to work out for themselves how I really did it. You're descendents will probably deny it what's under their noses and go back to
your scribblings. Only one 'x' in 'ox', Moses. And 'neighbour' has a 'u' in it. Me, help Me."

(If I had written this two thousand years age, there'd be people in Pennsylvania changing school boards to reflect it.)
Certainly, evolution has been used by some people to justify their atheism. Even Darwin himself found that he couldn't believe any more after he'd come up with his big idea. But is it completely beyond the wits of those such as these central PA people that HOW and WHY are two entirely different concepts?
Do you believe intelligent design should be taught in the classroom?Yes. I believe that ID should be taught in the classroom. But then I believe that Creation, the Native Australian Dreamtime, and every other theory of how things came to be should be taught in the classroom as examples of how pre-scientific peoples tried to explain things they didn't understand.
In astronomy lessons, we teach that people used to believe that the sun went around the Earth, if only to say "but now we know better". I suppose it's a small mercy that the Bible doesn't say "the sun goes around the earth" otherwise we'd have school boards asking that books about the moon landings have the addendum "this book contains ideas that may be part of an international Satanist conspiracy. Not everyone believes that men have walked on the moon."
And I believe that worthwhile science teaching shouldn't be trying to give kids
answers beyond the age of about 10, but should be teaching them how to think about phrasing the right questions that will help them evaluate all the different possible explanations to find the one that most fits the available facts. Then all kids will work out for themselves that evolution is the most useful way to think about the living world.
Of course, that will annoy parents who want their kids to be
told to believe in certain things, just like they were by their parents, and their parents before them, right back to whichever poor schmuck who's hot meals and sanitation were made conditional on agreeing with the person dishing them out.
If so why and do you also believe that it is legal?Yes; ID is not a religious concept in itself. As an idea it should be taught, just as an earth-centred universe concept should be taught, to illustrate that in the history of ideas, new and better explanations of observed facts are resisted for many centuries before becoming completely accepted. And it's most often been religion that has put up most resistance.
Do you believe that evolution should be taught in the classroom?Of course it should. Of all the ideas I've mentioned, it is the one that should be taught in
science classrooms, because it's the only one that is science-based.
On a wider issue, I think that the Constitutional separation of Church and State serves America least well in education. The UK has
compulsory religious education classes, ostensibly because the established church and the state are two facets of the same thing in the UK. (We also have compulsory hymn-singing and prayers, which is the fastest way to a secular society as any I know. Forcing kids to do
anything makes them hate it for ever more.)
But almost universally here, such classes study Religion itself as a whole, comparing and contrasting the different world religions, not just indoctrinating Anglicanism on all and sundry. In part, this is due to the way religion is viewed by the British - just another set of ideas, like politics or sport, and as central or peripheral as any other, depending on the individual.
I can't help feeling that part of that neutrality arises
because we force it into the curriculum in schools - it gets put in a box marked "religion" in most heads, and doesn't enter daily life.
Of course, that's just what fundies don't like - religion is
supposed to dominate every aspect of daily existence. But by having time set aside for religion, it takes a lot of pressure off other areas to conform. Science can be about science. Literature can be about human writers with photographs or paintings made during their lifetime, some of whom may have written things that conflict with this or that holy book.