If God Created The World Then Didn't He Create ity?

If God created the world, then didn't He create gay marriage? So why do some of His "children" want to be rid of that? After all, uality was around way back probably when the first cavemen had babies. I am pro-gay, and have a hard time understanding the people who either oppose ity or just gay marriage. If two people love each other, then why do we make their love illegal?