God of the gaps
From RationalWiki
"God of the gaps" is used to describe the tendency of believers to appeal to God as the cause for phenomena human knowledge has not yet explained. When these gaps are filled, the believer just jumps to the next gap and the game can continue ad nauseum until human knowledge is able to explain everything. It is not a very theologically sound argument since it has the unpleasant (according to believers) effect of reducing and diminishing one's god over time. From a rational or scientific perspective it's just silly. For the truly dedicated proponent, filling an existing gap merely has the effect of creating two new gaps around it. Intellectually honest it ain't.
One of the more prominent examples of current "God of the Gaps" thinking is the Intelligent Design movement, which claims that some aspects of how life formed are impossible to explain, not only with today's scientific knowledge, but ever.
The God of the Gaps argument finds what is perhaps its most popular manifestation in ideas about first cause. The argument essentially suggests that, as there is no commonly accepted theory to completely explain the original origin of the universe, then God (or Gods) must exist.
Another well-worn God-gap is that of Abiogenesis. Again, as there is no generally accepted explanation for the appearance of life on the planet, the default position - "God must have done it." is used by theists. There is probably an element of False dilemma in both the preceding arguments.
Amusingly, the Gödel Incompleteness Theory seems to indicate that God will always have a little gap left to hide in, no matter how much humanity learns.
