well, for one thing, viruses are not technically even alive.....neither a sperm cell or viruses will ever be able to reproduce themselves, grow or develop into anything other than what they began as.....
http://en.wikipedia.org/wiki/Organism
I appreciate that you finally made an effort. It's actually more than even your dumb friend, sf, has made. But, I don't think you even read your source or you would be aware that there is debate on the matter of viruses, that simple definitions fail to accurately describe what an organism is and NONE ARE UNEQUIVOCAL.
Haploids cells do grow and develop, so you are wrong on that point. We will never develop into anything other than humans, so your point about growing into something other than what they began as is not an accurate condition of an organism.
The zygote will never produce another zygote as a zygote. It has no hope of reproducing until and if it becomes a mature human and only then with the help of a mate. Even at maturity a human will never produce another human diploid alone but only haploids.
Likewise, if a haploid finds a mate creates a diploid that matures then it will be able to produce other haploids.
Maybe the male and female humans are just the means by which the sperm and egg haploids reproduce rather than the reverse. They find a mate and create diploids which they use to reproduce other haploids rather than we, the diploids, find a mate and create haploids which we use to reproduce other diploids. Clearly you are guilty of ploidy bigotry.
So why is the zygote or even a mature human an organism and the sperm is not? Because your definition, not science, tells you it is so?
Is the zygote a human organism. From your source....
An organism may be either unicellular (a single cell) or, as in the case of humans, comprise many trillions of cells grouped into specialized tissues and organs.
Yet, you reject that and claim the single celled zygote is a human. If the zygote is an organism, which is not a slam dunk, it is still a big stretch to establish that it is a human organism. And no, that does not mean it is a donkey.
You are grossly oversimplifying a very complex process and your definitions are not very helpful. The ACTUAL science says it is unclear and you reject that to demand that it is with definitions that fail simple tests.
There are other problems with your definition, i.e., a menopausal woman, a man that has had a vasectomy or, like usf, was born that way, can not reproduce. Are they then no longer organisms?