Why do you say that? Have you ever read his Philosophiæ Naturalis Principia Mathematica, especially where he discussed his Universal Law of Gravitation for the first time?
I would agree.
In fairness, however, we can’t help but observe that in actual practice a lot of ID proponents and their organizations are very much motivated by theological apologetics. For example, one only need look at their promotional literature and fundraising campaigns to notice that the original and/or theoretical “purity” of intelligent design investigations are not always preserved. We also notice that a lot of ID material is written for, published toward, and promoted to lay theists rather than to the broader acadeic community and peer-review. (I’m not saying that that targeting is necessarily a bad thing. I’m simply observing that it has become a huge part of the ID Movement.)