There is at least one piece of "evidence" for ID belief in nearly every aspect of science. But at the same time there is a non-ID piece of "evidence" that goes against it. For instance, those of ID often believe that a "Spirit" is involved in people or things that (at the same time) gives freedom of choice, and from it the ability to reason, so on... The people who believe something other than ID, or even those in ID who do not believe in having a "Spirit" would argue that there is no free choice or "reason," per say, but that the random or non-random (as in caused by something "in the world") path of electricity through brain neurons causes people to do the things they do. The "Spirit" group might say that the "Spirit" causes the non-random actions, but since the non-"Spirit" group denies the existence of such, and as at this point "Spirits" cannot be proven or disproven, the argument should halt until further evidence is revealed. However, the argument continues even though no new evidence has been shown. Also, even when new evidence is shown disproving "Spirits," one of the "Spirit" group might argue that the "Spirit" is or is caused by a god or God (god meaning one of many, God meaning one). Since this is fundamental to the argument in the first place, the whole thing boils down to a "faith" based belief, for both parties.
*I am not yet out of high school, and so have not been exposed to the doctrines of Christian, Evolutionist, ID, Muslim... or other college.