nearly every homosexual I know was raised by heterosexual parents.
I know single parents that have raised wonderful straight and gay children
I know married heterosexual parents that have raised wonderful childen
I know gay couples that have raised wonderful children
and I know divorced parents(both straight and gay) that have raised wonderful children.
I know of children who have turned out both straight and gay from every one of the above categories.
One's sexuality has nothing to do with their ability to raise a child.
To suggest that it does is like saying that if a single heterosexual father raises his daughter, she'll grow up to be a lesbian because he likes women.