If no designer is mentioned in Intelligent Design, I don't think you are required to go with God/creationism. Didn't Fred Hoyle come out with his hypothesis of panspermia sometime in the mid-70's? (If my memory serves me well.)
Hoyle and his fellow researcher Chandra something (can't remember and can't spell it) said that life forms, or complex organic (carbon-bearing) molecules, coming into the earth's atmosphere from comets, asteroids, planetoids, whatever, would provide the genetic Leg-O's necessary for macroevolution, which requires myriads of innovations which can't be otherwise accounted for in a mere geologic ages.
Hoyle did not propose "God" but there certainly lurks an 'unknown x" since he does not propose any kind of formula for the initial abiogenesis, which he assumes happened, but thought so vanishingly rare that it would necessarily take place outside of a strictly terrestrial time-frame.
I am in no way a statatician but when running the values around in my mind in the wee hours, it occurs to me that multiple universes would be needed for proper "accounting".
If time is constant, there isn't enough of it.