I'm going to try to respond to you in a civil manner.
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being gay is just flat out abnormal.

If by abnormal, you mean the majority of the population is not gay, then I agree with you.
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but the physical consumation of that love requires the improper use of the anatomy that they were given

I certainly hope you frown upon oral sex.
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So how in the world can anyone say scientifically say that something is not defective in a gay human?

If all humans were gay, then it would be a defect, yes. Are all humans gay? Are we at risk of becoming extict? Use your head, not your gut.
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From my point of view, marrying 2 men, or 2 women is just as bad as stealing someones's car at gunpoint. Both are equally wrong.

Ok, but WHY is it wrong, other than the fact that you find it disgusting?

Human beings have evolved to a point where genetic are not a determinant factor for behavior. Who the hell cares if a penis was designed to go only one place. Humans have great imaginations, expecially where sex is concerned. Who are YOU to tell people how to act. You certainly have a right to be offended, I'll give you that.

How does a homosexual union infringe on YOUR rights?