Explaining why the obvious design in the world (as we're assuming in this thread) points to an "Intelligent" designer...
The "obvious" design you refer to is not design at all. The problem is that you are viewing the biosphere through 3000-year old spectacles. The ancients had no explanation for life on earth, so they just said "god did it", and made up some stories to back up that hypothesis.
Nowadays, however, we know that all life on earth had a common ancestor, and evolved from it, and everything alive is related to everything else. DNA sequencing proves this.