Up to the point we have read in the novel, I feel that Victor fails to notice the humanity of his creature. We are still being forced to call him "monster" for lack of a better name. But in fact, Frankenstein is in many ways human. We can assume that Frankenstein (the monster) possesses some human DNA, because he is constructed of human parts. Then again, a body does not necessarily make a human.
I would have to say that language is a big part of what makes a human. Animals do have the ability to communicate, but only humans have developed oral communication. The monsters ability to create thoughts, and speak them, makes him human. If it wasn't for his appearance, he would be able to communicate with other humans.
The next attribute I believe that makes a human, is thought. Such as the ability to think, and form intelligent ideas and problem solving. The monster is able to think through problems and solve them. He understands the ideas of justice, alienation, and rights. Although is rationality fails at times, and he does not choose the right way to solve things, his thought process makes him very human.
Lastly, I believe our emotions make humanity. He is able to feel sadness for the cottagers, and also excitement for the cottagers when Safie comes home. Frankenstein also expresses his emotion to Victor about his loneliness, and the pain he suffers.
While several readers may not believe that the monster is human, I think that he possesses several human qualities even if he fails at times.