Originally posted by Spiderman
It shouldn't matter whether I'm a Christian or not, but nominally I am.
As far as I know, there's only one place in the Bible that explicitly condemns homosexuality and that's in a section that has a bunch of other "outdated" laws or proclamations. In addition, I would rather see something from the New Testament or Jesus' teachings that condemn homsexuality, since he supercedes a lot of teachings from the Old Testament (like instead of "eye for an eye", it's "turn the other cheek" and "love thy neighbor").
I hate to break it to you, but even if it is for the "tax breaks" (which I really doubt, there's a heck of "better" benefits to being married than that), hetero couple do it for the same reasons. Heck, you have immigrants getting married to citizens just so THEY can get their green card or be legalized or whatever.
Same thing with monogamous relationship: heteros face the same issues.
In short, so far your reasons for being against gay marriages equally hold up for being against hetero marriages.