there are 2 aspects to this issue: the first is that the "issue" is being used as an attack on religion by those who care not for anyone's feelings. they just want to stop religion and religious people from procreating, which results in fewer religious people. i DO NOT support that, it is a good reason to sign the petition, ie, to impeded attacks on religion.
HOWEVER, there is the issue of gay people themselves. not very many of them are "gay on purpose in order to defy God", instead a lot of them feel that they were "born that way". they are NOT trying to offend God and are merely seeking the same benefits as other married couples, for them, i support the issue. one of the reasons is that in a secular society, everyone one has rights...for the most part. it is those SAME rights that allow us to exist as religious people in a secular society. if people can be banned from marriage for being gay, then Muslims could be banned from being married for being Muslims one day. (don't think they won't try it.)
if people want to ban something that they feel is evil, let's petition to ban shirk or polytheism. THAT is the only unforgivable sin.
actually, i could see "gay marriage" banned in a Muslim country, it isn't illogical. but i find it very odd for a "Christian" to think it should be banned, what with the "Jesus died for all my sins, so i basically have carte blanche to do anything that i want." if you feel that is so, then any sin you think they are committing is automatically forgiven. (i'm not saying that it makes sense, but it isn't my religion.) in Islam, your shahadah only clears you of past sins, you ARE ACCOUNTABLE for ALL of them after that.
how about if we just ban people from talking about who, or what, they are having sex with? i DO NOT need to know, no one does.
for all i know, some gay people may get to Jannah eons before i do, IF i do, Allahu Alam.
let's make sex PRIVATE! but a ban on shirk or polytheism...i could probably go for that! (but the Christians wouldn't be in support of it now, would they? ;D)