All in Intelligent Design
A theist may sometimes use a god-of-the-gaps argument when faced with a gap in our knowledge for a natural explanation for something. But if that gap begins to be filled with evidence from science, history, or logic and it increasingly points to God, a non-theist will often make a fantasy-of-the-gaps move to avoid it.
Most people who accuse someone of committing the god-of-the-gaps fallacy are mistaken. Here is the difference between a legit argument and a god-of-the-gaps argument.
Science is now in a position to analyze effects to see if they test positive for requiring intelligence to produce. Applying that scientific method to biological life reveals that the fingerprints of intelligence are all over the genomes of life.