Why do people debate intelligent design, evolution, God, etc?
Intelligent design is a theory which aside from the obvious, means it can't be proven. Regardless, it's still an entertaining debate subject.
Science revolves around LOGIC. Logical thought supported by raw data, mathematics, physics, and all of the collections of data found in each scientific specialty. In this way, LOGIC can be thought of as the language of science.
On the other hand, religious and theological beliefs exist outside of scientific boundaries. They are solely dependent upon FAITH, which is nothing more than voluntary belief in something that can't be proven. In this way, FAITH can be thought of as the language of religion.
Discussion and debate primarily use LOGIC, and they are scientific constructs that are used for exploration from a scientific point of view. So in a way, discussing and debating religion is like using the wrong language to interpret results.
Put simply, intelligent design cannot be supported in a meaningful way using logic since faith is the required element for assuming its validity.
Strangely, and as a side note. Scientists who consider faith and theory as valid scientific tools for creative discovery consider intelligent design as a valid option where clear answers are yet to be found. Some of the greatest minds of mankind from Einstein to today's theoretical physicists start with a theory and enough faith to consider throwing math at abstract ideas until something works.
Even Einstein believed in God. He could be wrong, but I feel his theories are better than most of ours. When in doubt, why not go with what the smartest dude in the room said?