If human thought is evolution of memes, what's the difference between Darwinism and intelligent design?

The first part of the title refers to what Dawkins popularised, but Herbert Spencer already described it at the social level two years before the publication of the Origin of Species. (Neither Dawkins nor Spencer convincingly grounded the theory in random variations as Darwin did.)

The final term refers to the claim that various wonders of nature could only have been designed by something intelligent, irrespective of what that something is.

My point is that if you believe the former then the latter is moot.