what would jesus abraham, jacob, or david do?

does the bible argue for gay marriage? newsweek's cover story poses the question, along with this: how does the bible define marriage?

"Shall we look to Abraham, the great patriarch, who slept with his servant when he discovered his beloved wife Sarah was infertile? Or to Jacob, who fathered children with four different women (two sisters and their servants)? Abraham, Jacob, David, Solomon and the kings of Judah and Israel—all these fathers and heroes were polygamists."

modern marriage is defined in two separate institutions: civil marriage, and religious marriage. atheists, people too old to have children, the infertile, and – on a whim – a couple in las vegas, wasted out of their minds, can marry. god probably has little-to-nothing to do with any of those marriages. (i'd guess the couple in vegas does not have god on their minds. nor do the atheists, certainly. and while the infertile couple might be believers, they have no intent, or ability for that matter, to be "fruitful and multiply".)

while i am perplexed at the notion that because you believe something to be true, i must follow those same rules, no matter my beliefs, i wonder what would happen if i decide not to follow your rules? maybe i'll pull some tom ackerman on you:

I no longer recognize marriage. It’s a new thing I’m trying. Turns out it’s fun. Yesterday I called a woman’s spouse her boyfriend. She says, correcting me, “He’s my husband,”

“Oh,” I say, “I no longer recognize marriage.”

and if you really, really, really want to protect families, and children...