It is probable that God made different type on man so he could keep easy checks on whether one tribe or another was Godly or needed smiting. As He had, at the time of Noah, already designed all the animals, this left him with a problem of what all tribes should look like.
Obviously, the direct descendants of Noah looked like Adam, who looked like Jesus who looks like the normal pale-skinned, blue-eyed, fair haired person. Then he did a bit of work on the eyes and invented Orientals, then he tinted the skin to various shades and we have Injuns, Dot-heads and Arabs, he then started to look around.
I don’t think that today, in a modern world, we can accept the words of the famous rhyme from “A Christian Child’s Garden of Verse”:
“God made the little nigger boys,
He made them in the night;
He made them in a hurry
And forgot to paint them white.”
Rather, the research seems to suggest that monkeys and Darkies inhabit the same parts of the world and thus God suited them to their environment.
The resemblance is therefore purely practical.