As a commenter posted previously, European polling shows support for gay "marriage" but opposition for gay adoption. This is exactly why there were so many protests in France.
I've said before, I think it's legitimate under secular law to allow for some kind of legal recognition for things like visitations and property inheritance. Adoption is precisely the issue is with gay marriage. So to say that you support gay adoption is exactly the same as saying you support gay marriage. The artificial creation of unnatural families where children cannot rightly identify with their own gender or the opposite gender by the absence of a natural parent is not just. Adoption or bio-manufacturing of children for raising in gay relationships is the only real issue that is being fought over. The rest of it is really semantics.