If we can design intelligences, most intelligences will be designed.

How do you prove that creating beings do not number greater than the intelligences they have created?

Of those intelligences, most will be smarter than us because otherwise they would have little use.

We create simple machines and inferior artificial "intelligences" with limited capabilities for menial tasks. It seems to me that it would make more sense to create many inferior intelligences for menial works, especially in robotics. For example, in mining, to reduce human loss.

We are likely designed intelligence.

How do we know a god exists? Or how do we know this god can create intelligences like ours, just because we (for the purposes of this hypothetical) can?

Our creator is even stupider [sic] than us.

This assumes that designed intelligences must be superior to their creators, which is not logical, as I pointed out. Still, let us assume there is a creator that is, as this comic states, omnipotent.

If this god is omnipotent, it would have, by virtue of omnipotence, no irremovable restrictions on its power, meaning it could expand its own intellect. So we cannot assume it is dumb.

If humans are created for our use, as the comic suggests, then this god must be self-serving. If the god that creates humans is omnipotent (and therefore capable of expanding its intellect) and self-serving, why create humans? The only reason that is visible to me is for worship or some other self-gratification. Why make worshipers with superior intellect? Imagine "awesome is the god who has half our intellect" as a hymn of praise! If anything, it is an insult.

God is all powerful and dumb.

If a deity is all-powerful and dumb, that deity can increase its intelligence because it is omnipotent. One cannot be both omnipotent and incapable of increasing one's own intelligence. For if one is incapable of anything, that being cannot also be omnipotent. One could argue on this basis that, since a lack of intellect is a disability, it is a lack of ability, and therefore incompatible with omnipotence.