First off, here's a question for all you Christians: "Is it a sin to allow a sin to happen?"
If it isn't, then people who are against gays are really just being hateful and intolerant (which are the opposite of the message of Christianity). Gays that aren't hurting you and aren't hurting your chance of getting into heaven should just be allowed to love whoever they want. Let them get themselves sent to hell, it's their decision.
If it is a sin to allow gays to love each other, then I can kinda see how the Christians are coming from.
Sorry if this doesn't make sense, it's late.