First, ID is decked out in the trappings of Science, which takes it out of the Belief category (Belief being 'knowing' something is true without proof), and into the realm of Science. Science allows for theories to be checked against real world observations.
Second, there is a logic gap here; if the Universe is intelligently designed, it does not automatically prove that the Biblical God did it. Other possibilities exist, some are:
The Universe is itself intelligent.
The appearance of intelligence is an artifact of our perceptions & mathematics.
Some other extremely powerful entity created the Universe.
We can now fairly competently observe the Universe, and the Earth, and the structural levels below us down to the subatomic scale. We can draw some interesting conclusions on the traits of any designing Intelligence, and compare them to our cosmological ideas. There are some things we shouldn't overlook.
Just a few:
All of the local atoms (in our bodies, on the Earth, in the Solar System) heavier than iron came from other exploding stars- novas.
The Hubble has seen so many planets around other stars that we can conclude that planets are not unusual, and perhaps most stars have them. We also see many novas out there, some in recent times, so we must conclude that not only is somewhat 'hard-hearted' recycling going on, but that Creation itself is still going on.
Human mapping (and the thinking it produces) almost always has the flaw of placing the 'locals' in the center of the frame. Page through an atlas and you'll find every country 'surrounded' by its neighbors, which of itself has caused many wars. The ancient Egyptians and Greeks knew and proved the Sun did not go around the Earth, altho it took two thousand years for everybody to accept the idea of not being at the center of things. Astronomers now are quite confident that our very ordinary star is on the fringes of our galaxy, which itself is part of a cluster far from the center of the universe.
What this implies is that we are not the primary focus of any Intelligent Designer, but just one 'project' among many.
Everybody knows about the big Dinosaur Die-Off, and paleontologists have found it is just one of many on Earth. Ice Ages have also pushed Life around pretty badly too- just look at Antarctica. (It's an urban myth that the dinos died to create oil for SUVs, they were not the source of the Earth's oil
At least on Earth, Life must struggle with the outcome uncertain. The dinosaurs existed for 100 times the span of humankind, and were then thoroughly erased. One must wonder about the purpose and implications of that within Intelligent Design. It is certainly a challenge to both designer-free Evolution and Omniscience in any designer. (During the heyday of Newtonian physics, people accepted the Great Watchmaker view of Creation, where the dinos were a botched experiment on the evolutionary road of progress to us.)
Within our biosphere, pretty much all Life must eat Life to survive. It wasn't always this way. The first critters in the primordial ocean took nutrients directly from the water, but as the eons passed they became first scavengers and then predators on each other- and then competition became a real life & death matter. We shouldn't be surprised that death and afterlife are at the core of all our religions, but what does this say about the designs of any Intelligent Designer? Chaos would be less cruel than our world is to all its creatures, with or without any afterlife.
Those proposing Intelligent Design must deal with all the knowledge we have of how our world works, or as it used to say in the Rosicrucian's comic book ads- this knowledge must die.
