“Going down the ID path only one question remains......”
Yes, and ID doesn’t attempt to answer that question, but then again, evolution doesn’t attempt to answer where the first common ancestor organism came from, before all the modification, adaptation and variation happened.
Out of the “big 3” (evolution, ID, and creationism), only one actually proposes a “buck stops here” type of hypothesis.
Yes, basic evolution theory addresses only the observed facts of 1) descent with modifications and 2) natural selection, meaning it only applies once life has clearly started.
However, a number of hypotheses have been proposed for how life first arose on Earth, and those typically include the operation of evolution on non-living organic chemistry.
Indeed, they can begin with something called a self-replicating organic molecule, which replicates imperfectly thus from the very beginning allowing for natural selection of the best adapted molecules.
Thus evolution was likely closely involved, even before complex organic chemistry became very primitive "life".