I don't have a problem with gay people. But I personally wouldn't want two mothers/two fathers.
I think it's important that a child has some sort of role models for each. Myself for example, I raised by my Dad, with no contact with my Mam (until a year ago), but I turned out ok because I had my Gran, so I still had that motherly role figure/guidance.
Now my brother for example, was raised by his Dad with no motherly figure at all and he's a complete and utter ****. He treats women like ****, he has no trust with them, he has no ambition - currently on the dole and to my knowledge is not looking for work. He spends the majority of his time smoking joints.
I know these are only two examples, but I personally think a mother and a father is preferable (or some other figures like that). Having said that, some people will grow up without the other parent for various reasons (split up, death etc) and i'm pretty sure they can turn out alright too. I don't know, I don't have a problem with gays adopting, but personally I wouldn't want them for parents.