There's a central pro and a central con to homosexuals adopting:
-the pro is that you get more children out of the system and into a normal lifestyle
-the con is that you advance the abnormal lifestyle of homosexuality
The parent's sexual orientation is not a factor in the child's- their physical desires will stem from their social life in school or otherwise among friends.
The ONLY way a person can say otherwise if they propose that the parents themselves will influence them to be gay, which of course is as ridiculous as saying they are all 'pedos'.
On the other hand, what will affect the children is the acceptance, in which they will not impress upon children of their own a traditional sanctity of sexuality. In other words, it's a stopper in said traditional heritage among any who are adopted to gay parents.
I recommend, simply, that people weigh these things rather than act dumb about it- it's happening, and you'll get nowhere simply relating them to Satan