This link was probably one of the scientific articles that i've read about this article so far, Are People Born Gay? Genetics and Homosexuality

But anyways, this is how they "are" now, whether they born this way or not.
I personally think saying gay people shouldn't be gay, is like, for example saying someone should not like ice cream while he/she actually do like it and enjoy it.
It's their personal business.
And it's the majority of society who (if possible) can change anything in a country. But it definitely needs time depending on the culture of the country.
Just like majority of Sweden, Holland, Norway, Denmark, and..... Supported this idea so now the minority of them who do not support can't do anything but at least they can don't care about it, can't they?! And if they can't respect, at least don't disrespect them "just" because they're gay.