Greetings!
Your arguments can be easily dismantled with very simple reasoning.
Animals Do It.
Although you say "nevermind that animals do it..." since you drop this line of justification for homosexuality, etc. in (and others continue the thought), I will address it.
That animals do or may not do something or behave in some way is absolutely no justification for human beings doing the same thing.
Examples illustrating the point extend from killing for killing's sake (not just food or to eat) which some animals do, to eating one's vomit, bedding down in feces and mire, to licking your own ass, etc. etc. all of which both as intelligent and "civilised" human beings coexisting in a society we can plainly understand to be unnatural an an abomination to our sense of proper conduct.
Animals may do it but human beings should be more than mere animals. Thus allowing for your assertion that animals may engage in homosexual behaviour that is simply not a proper justification for humans to engage in homosexuality.
Genetic Disposition or Outcome
Much of your post is concerned with setting forth the argument that Homosexuallity is genetically based. You then state that because this is the "natural" order of things, ostensibly created by God, that He is thus responsible for such a creation.
Your post shows a lack of understanding of JW theology.
JWs believe that human beings since Adam and Eve are genetically defective. Thus the reason that our bodies eventually break down, succumb to defect in processes and ultimately grow old and die--all due to our common inheritance of imperfection.
Any thing that we would classify as a genetic defect whether it be Down's Syndrome or (conceding your proof) Homosexuality is simply that: a genetic defect and is therefore not the result of God's Creation but a byproduct of Man's Fall from perfection.
Thus you can cite as must proof as you want that there is a correlation between genetics and homosexuality but it doesn't jive with your argument that God is responsible.
Assuming again that Homosexuality is not a lifechoice (although the sexual acts themselves are obviously and patently a matter of choice because abstinence is a choice made by persons of all sexualities), and the average homosexual is the product of his genes, there is always the age old argument that who we are in life is the product of both our genetic inheritance AND (the environment or our upbringing), i.e. Nature vs. Nurture.
Thus while we can be sympathetic and even compassionate towards those unfortunate individuals who have been born with this genetic imperfection, just as we would again say towards a person with Down's or MS or any congenital problem, we still can recognize that it is a problem and that the situation is not natural, i.e. an abomination.
I know what I have said is not very palatable and certainly isn't politically correct but this is simple clear reasoning and I think a correct counter to your arguments.
Sincerely,
Eduardo
PS: to the person and others that were discussing 1 Cor. 6:9:
you are correct in saying that the literal translation of Malakoi is "soft men" however in interpreting this to mean Cowards or something like that you ignore the very next clause ("nor liers with males") which seems to suggest a double emphasis to the prior Malakoi. The understanding that this scripture includes reference to homosexuals, men who lie with men, is not a Jehovah's Witness interpretation but the concession of all (that I know of) bible scholars and certainly all bible translations that I have ever encountered.