Here's my thoughts on the subject (now that I've consumed an entire pot of coffee and my brain is functioning somewhat)-
The Bible is very clear on the topic of homosexuality; God says it is an abomination. Nowhere does it call blindness, or deafness, or being born with only one arm, or mental handicaps, an abomination (wait, it doesn't right? More coffee!!).
Based on that alone, it makes zero sense to me that God would create a tiny child who is, at birth, gay.
I do think that each and every person is born with their very own unique set of traits (duh, right?) and therefore, also with their very own unique set of weaknesses, things they are likely to be tempted by as they grow up.
For instance, some people's downfall is alcohol. Personally, that doesn't tempt me in the slightest. However, I have a really hard time saying no to cake...cookies...ice cream. I know a lot of people who don't understand why that's hard for me; they just aren't tempted by deliciousness, I guess.
Also, they're skinnier than I am.
Anyway, I wasn't BORN a sugar-fiend. I didn't come out of the womb demanding doughnuts. I didn't much care one way or another about sweets until I was older. At some point in my childhood, I was exposed to baked goods, and had I not had my mother to tell me "no more", I probably would have eaten nothing but cake. Now, I fight the temptation to gorge on sweet foods, because hey, remember gluttony? Yeah, bad stuff.
My point is, that particular weakness, that temptation, was triggered for me in my childhood. And instead of saying "No thanks", I said "More please!"
But it doesn't mean that people are born as gluttons, or gay, or alcoholics, or murderers, or adulterers. At some point, they are presented with a choice to become that way; to give in to the temptation, or not.
...I hope all that made the kind of sense I intended it to.